How AR-15 Looks to the Media

AR-15 Barrels 101

 

• Tumblr
• StumbleUpon
• Print

by Jerry Kraus
    

One of the biggest differences in cheap versus high-end AR-15s is the quality of the barrels. We are going to cover the pros and cons of Mil-Spec chrome molly steel chrome-lined barrels versus match-grade stainless steel, non chrome-lined barrels and help you make an educated decision on which is right for the intended purpose of your next AR-15.

Although it is unlikely that most of us will ever “shoot out” a barrel; chrome-lined barrels handle extensive shooting and adverse weather much better.

Most AR barrels fall into one of two categories: either they are made of chrome molly steel with a chrome-lined bore and chamber, or they are made of stainless steel, which typically does not have chrome lining in the bore or chamber.

First, let me say that if the bore (barrel) is chrome-lined, the chamber will be as well and likewise, if the bore is not chrome lined, the chamber will not be either. Chrome molly steel is harder than stainless steel but our main focus is going to be on the chrome lining vs. non-chrome lining aspects because that is what will have more effect on AR-15 shooters.

The Pros and Cons of Chrome Molly Steel Barrels

M16/M4 Mil-Spec barrels are made of chrome molly steel with chrome lined bores (and chambers). So let’s detail the pros of chrome molly steel barrels that have chrome lined bores and chambers first.

The Pros of Chrome-Lined Barrels

The military loves chrome-lined barrels because of:

1. Corrosion Resistance.This is especially important in wet and saltwater environments. When the military issues M16s to our troops in Vietnam, it was initially issued without a chrome lined chamber, or chrome lined barrel, and without a cleaning kit. This, combined with a very corrosive powder and the wet jungle environment of Vietnam, caused countless deaths to our own troops mainly because of failures to extract the spent round in the chamber during combat. The only way to clear a failure to extract is to run a rod down the barrel and knock the spent round back out. According to the article “Defense Under Fire” in Time magazine dated 9 June 1967; “We left with 72 men in our platoon and came back with 19. Believe it or not, you know what killed most of us? Our own rifle. Practically every one of our dead was found with his [M16] torn down next to him where he had been trying to fix it.” —Marine Corps Rifleman, Vietnam. Though eventually remedied, it illustrates the value of chrome-lined barrels and chambers.
2. Extended Barrel Life.This is the biggest reason the military uses chrome-lined barrels. Every round down range creates heat in the barrel from the hot gasses that the powder creates and the friction of the round, both of which result in barrel erosion over time. The higher the velocity of the round, the hotter the barrel gets resulting in even more barrel erosion. The faster the rounds fire in succession, such as on full auto in the military, the hotter the barrel gets and stays hotter, longer, all resulting in drastically more barrel erosion thus substantially shortening the barrel’s life, commonly referred to as “shooting out” the barrel. An AR-15 with a Mil-Spec barrel identical to the Mil-Spec barrel of the M16 will last roughly twice that of the M16 barrel. This is largely due to the fact full auto rates of fire are exponentially detrimental on barrel life. Non chrome-lined barrels wear out even faster with full auto fire, this is the biggest reason the military uses chrome-lined barrels. Most people, however, will not be able to “shoot out” a chrome-lined AR-15 barrel in their lifetime, and if you do, you should consider yourself very fortunate to be able to shoot this much! “Shooting out,” or wearing out the barrel, will become evident when you can visibly see your chrome disappearing in your bore and your groups keep getting bigger and bigger.
3. Ease of Cleaning.This is a definite side benefit of chrome-lined barrels and chambers. Some people think this is only slightly easier to clean, however my experience is that it is substantially easier and faster to clean. So, in short, chrome-lined barrels protect you from erosion and corrosion and easier cleaning is a bonus!

The Cons of Chrome-Lined Barrels

The biggest disadvantage of chrome-lined barrels is long-range accuracy. When a barrel is chrome lined, even with the best technology available today, it is not perfectly even. Because it is not perfectly even on the inside of the barrel, there are very slight high points that obviously will negatively affect the accuracy of the bullet. However, this is only noticeable at long ranges. There are plenty of chrome-lined barrels out there that will give you sub-MOA accuracy, which means a three-round group in less than one-inch at 100 yards.

People will disagree as to the ranges it becomes noticeable, but it is the author’s opinion that it is beyond 300 yards—beyond three football fields. Just to be very clear, the average soldier or civilian with some training should be able to hit a man-sized silhouette target at 300 yards with an AR-15/M16 that has chrome-lined barrel.

Even with a chrome-lined barrel, the biggest factor holding back the shooter’s accuracy beyond 300 yards is going to be shooter error, lack of training, or practice for probably 90 percent of the shooters out there.

The Pros and Cons of Stainless Steel (Match Grade) Barrels

Match grade barrels offer few advantages at ranges below about 300 yards, but at that distance and especially beyond, the accuracy difference becomes obvious. This makes stainless steel, match grade barrels and absolute must for long-range target shooters.

The second major category for AR barrels are stainless steel barrels, which are typically not chrome lined in the bore or chamber, and these are known as “Match Grade” barrels.

The Pros of Stainless Steel Barrels

Extreme benchrest shooters, NRA High Power Long Range shooters and Civilian Marksmanship Program (CMP) shooters all demand “match grade” barrels—meaning barrels made of stainless steel that are NOT chrome lined. “Match grade” barrels are more accurate and the longer the range, the more apparent this becomes.

The Cons of Stainless Steel Barrels

The cons of match-grade barrels are that they wear out faster, they are harder to clean and they don’t resist corrosion as well as a chrome-lined barrel. Again, let’s clarify that most shooters will not wear out even a match grade barrel in their lifetime. As far as cleaning goes, if the barrel is broken in or “shot in” correctly, the barrel will have a burnishing that minimizes fouling and subsequently makes the barrel much easier to clean; however, still not as easy to clean as a chrome-lined barrel.

Which Barrel is Right for You?

So you’re probably wondering which is right for you, right? An AR-15 rifle is merely a tool, a tool for doing a job. Which job do you want your AR to do?

The Ideal Barrel for defense or Plinking-to-Medium Range Target Shooting

If you are like most people you are you picking out a tool that would be ideal for you to defend your family, your ranch or your home with and maybe do some plinking to medium-range target shooting.

On the other hand,  maybe you want an AR for the commie invasion of the USA or the total collapse of society? Or even, as my younger friends ask me, “What AR do I want for the zombie apocalypse?”

If the answer is yes to any of these questions, then I would choose an AR-15 with a chrome-lined barrel and chamber. These are very common and is the same barrel configuration the military uses. I wouldn’t care if it was cold hammer forged or not, and if so, that would be a bonus.

The good news is ARs with these features are very affordable. There are two I like for under $900 from www.CheaperThanDirt.com – Armalite M15A4 and the Bushmaster Optics Ready Carbine (OBC).

I would also encourage you to get one for your wife or girlfriend when you can afford it as well. If the unimaginable happens, you will wish she had one and knew how to use it.

The Ideal Barrel for Extremely Long Distance Shooting or CMP Matches

Let’s face it fluted barrels just look cool. More importantly, the fluting reduces weight and dissipates heat at a much quicker rate than straight stock barrels.

I know what you are thinking, “What if I want a gun that can shoot accurately at extreme distances because maybe I am thinking about participating in state or national CMP matches?”
What you want is an AR with a stainless steel non chrome-lined match-grade barrel, cold hammer forged would be a bonus. In this category, www.CheaperThanDirt.com offers an AR I like for under $1300 – the Rock River Arms (RRA) LAR-15 National Match A4. Rock River Arms is a high quality manufacturer and they won the contract to supply the DEA with AR-15s.

Now you have a better understanding of AR barrels and chrome lining and what will work for your needs. Next we will cover .223 chambers versus 5.56mm chambers and more!

Until then, shoot safely and shoot often!

Para Bellum - Preparing For the Worst

                                              

 

Are you prepared, gun-wise, for a societal breakdown?

By Steve Adelmann     

Have you seen the movie “Something Wicked This Way Comes?” Unfortunately, I have, but aside from bad acting, ’80s clothing, a weak plot, terrible special effects and the 94 minutes it sucked out of my life, the movie had one thing going for it: a catchy title.

 

That phrase is on my mind more and more these days, except it is not an evil (and cheesy) carnival owner who threatens us, it is genuine trouble on a global scale.                               

                                                     

A quick scan of news headlines, market trends or simply paying attention to the nearest protest yields multiple red flags. Attitudes and conversations with just about anyone tell me I am not alone in my thoughts. I have no idea how the country will be doing when this column is printed, but I am positive things will not be any better than they are as I write it. Actually, they may be much worse.

 

So what should you do about it? Prepare. In this case I am talking about preparing your firearm game plan for a sustained societal breakdown—imagine a violent mob or gang is within a half-mile of your residence, intent on taking whatever or hurting whomever they want, and then plan accordingly.

 

Like most other folks, a handgun is my go-to choice for dealing with an immediate threat in the home or at close range on the street. But, I will choose the rifle’s ability to keep bad things as far away as possible if I see them heading my way. If trouble is inevitable, make use of any warning to be as well armed as possible. Get your go-to gun out of mothball storage and have it within arm’s reach at all times. Deployed troops learn to live with rifles strapped to their bodies, always. The practice is now taught in Basic Training, which makes a lot more sense than some of the idiotic parade stuff we did a quarter-century ago. There is no handier place for your primary fighting tool than across your body or in your hands. Plop down $40 for a decent tactical sling and get used to it. Consider that gun an extension of your arms and don’t get caught without it when the heat is on.

Fodder
 

The U.S. military’s switch to the new “green” ammunition has resulted in excellent prices on surplus 5.56 NATO M855 ball ammo. M80 ball overruns have pushed more surplus 7.62 NATO FMJ ammo to the market, too. Both are good general-purpose rounds to keep on hand in case the premium stuff becomes scarce. AK ammo—particularly in 7.62×39 mm—is very cheap and still available in sealed tins. The 40 rounds of .308 Win. my local hardware store keeps in stock will be scarfed up during the first 5 minutes of a crisis, so I know better than to rely on purchasing ammo around here.

 

Several retail outlets offer bulk deals on ammunition in the most common rifle chamberings, so stock up—now—on what your rifle will digest. Be sure to store ammo in a location that is temperature and humidity controlled. Old ammo cans with intact rubber seals make good containers, but place desiccant packs inside each one, and avoid leaving them in extreme heat or cold. Buy as much spare ammo as you can afford and store safely. Some is better than none, and a lot is better than a little.

 

Properly cared for ammo will last for many years, so if things get all rosy again, have fun with it at the range or will it to your heirs. Ammunition has real value, unlike the dollar, so it will be useful for barter, too.

 

You may not convince your neighbors to have gun or caliber commonality, but consider doing so within your family. Logistics will be much simpler if your family firearms are the same—anyone will be able to pick up another’s rifle or spare ammo in a pinch. Remember to plan for spare magazines, including extras to replace those lost or damaged during a protracted emergency. Think months, not days.

 

During a protracted and potentially violent crisis, your primary arm cannot be too close. A simple, inexpensive and effective combat sling like this B-Sling from Sheriff of Baghdad will be indispensable.

 

Gun Gear

A wide variety of equipment is available to carry extra ammunition and/or magazines. Find something comfortable enough to wear for at least a few hours at a time, handy enough to get on quickly and able to carry extra personal gear like medication, a light, knife, etc. If you have never had to live in, run with or go prone while wearing a military-style assault vest, borrow one, fill it up and try these tasks before you spend a week’s pay on the latest “rack” system. Many models were designed by people who meant well, but never fought while wearing a full vest. Less bulk and greater simplicity equal more agility, comfort and the ability to wear for longer periods.

 

A spare parts kit is also a good idea. At a minimum, extra faster-wearing parts like extractors, firing pins and springs are good to have around. Maintain a set of critical parts for each rifle you plan to have in someone’s hands during a crisis. I recommend at least one spare bolt for each rifle type, too.

It will never expire, so if the worst never happens, you have a part that will be useful down the road.

 

Think about a backup plan for optics, too: iron sights, a backup scope—something that allows you to aim the rifle if your primary sighting system is damaged when there is no way to get a replacement.

 

Training

The best rifle is not worth a lick if you cannot use it fluently under stress. Practice practical shooting.

 

Shoot at partially exposed targets at or beyond the distances your house/yard/property may present. Shoot in hasty, uncomfortable positions and in low light, if possible. Learn to shoot from cover and understand the ballistic differences between cover and concealment. Ensure someone else in your family is able to implement the home-defense plan without you present—you may not be there when trouble strikes, or you may need help.

 

The concept of a zombie apocalypse used to get a passing laugh. It is no longer a joke. Such talk is now thinly veiled code for a violent, man-made catastrophe. Do not be complacent with your approach to defending your family when—not if—things turn nasty. The rifle in your hands may well become the great equalizer you need to keep bad people away from you and yours. I truly hope I am wrong about where we are headed, but I will be ready if I am right. I hope you will be, too.

Sling Up!

A sling is a must-have accessory for your self-defense rifle or shotgun, but you must know how to prevent it from getting caught and slowing your movement.                         

By Kenan Flasowski 
   May 13, 2013                                         

If you have a long gun for self-defense, the first thing you should mount on it is a good light. The second thing is a good sling. While my personal preference for ARs is a two-point sling like those from Viking Tactics or the Vickers Combat Applications Sling from Blue Force Gear, I think single-point slings are fine for shotguns. No matter which type you prefer, you need to think about what to do with the sling when the gun is not in your hands.

Most of you probably keep your long gun stored in a safe, closet or behind the door. Some keep one in their vehicle (most law enforcement officers have one in the trunk or in a rack). When something happens that requires you to grab the gun, the last thing you want is for the sling to get caught on something and slow your movement. This can also be a concern when you are moving or trying to take a standing shot.

A simple solution is to run a couple of heavy retainer bands (rubber bands) over the sling near the buttstock. Then “S” fold the sling loop and tuck it under the bands. This will keep the sling tight against the side of the gun. It won’t interfere with the operation, but it will prevent hang ups as you pull the gun out of storage. When it is time to “sling up,” simply grab the sling and pull—the S-folded excess will come out of the retainer bands and you can slip it over your head and support arm.

For single-point shotgun slings, I put the bands over the stock and tuck the sling against the stock opposite where my cheek goes, so when I get time, I can deploy the sling and slip it over my head and arm.

This only takes a second or two for either an AR or a shotgun, and it really pays dividends when you have to move and/or engage quickly as soon as you pick up the gun. It also prevents those embarrassing hang-ups on gear shifts, door knobs and all the other things out there waiting to grab loose straps and gear.

At the first opportunity, sling up and continue.

Law Tactical Gen 2 AR Folding Stock Adapter

 

A folding stock on a direct-gas AR? Yup. And it works.

By Steve Adelmann                     
                        

Innovation is cool, but when it caters to my particular wants or needs, it rocks. AR enthusiasts have long lamented side-folding stocks do not get along with the traditional direct-gas-impingement (DGI) operating system due to the need for bolt carriers and buffers to operate behind their receivers. Over the years, a small number of specialty manufacturers have developed work-arounds to the problem, but they have fallen short of offering a drop-in aftermarket option to convert existing DGI ARs to side-folders—until now.
The Law Tactical Folding Stock Adapter is a 90-percent solution to the problem. The only thing stopping it from being a full-on conversion unit is the fact that it is not designed to allow firing with the stock folded. I carried folding-stock carbines and submachine guns during my Army days, and the circumstances where I needed to be able to fire them without first deploying the stock were limited to a handful of times involving extreme environments or circumstances. Even on my wildest day my civilian life is a bit tamer, so I can handle this limitation to the stock’s utility.

All that is needed to convert your existing AR to the Law Tactical system is the ability and tooling to remove the buttstock and buffer assemblies. Tutorials abound with step-by-step instructions for this procedure, so I won’t go into it here. The process will be smooth if you apply proper tools and attention to detail. Once the stock and recoil assemblies are removed, the included instructions clearly explain the process of installing Law Tactical’s hardware. The removal and installation procedures only used up 20 minutes of my day.
 

Simple tools and good instructions are all you need to add the folding stock adapter to your direct-gas AR.

After installation of the Law Tactical kit, the stock retains its original fixed or collapsible nature, but also folds to the left side with the press of a conveniently-located and protected spring-loaded button.

The stock does not lock in the folded position, but hinge tension is easily adjusted with a hex key to keep it folded. It is easily deployed/extended by simply unfolding until it locks open. The latch is stout, and there is no doubt when it locks to full extension. Time to deploy the stock is faster than to extend a stock that has been collapsed to its shortest length for storage. A collapsible stock’s original endplate and castle nut are retained for use with the Law Tactical system, so any sling attachment points located either on the endplate or the stock remain usable. The kit will work on mil-spec and commercial receiver extensions, A1 or A2 fixed stocks and on both 5.56 NATO- and .308 Win.-sized AR platforms.

If there is a glitch in this system, it is in the way the designers have tackled the problem of filling in the inch-plus space between the rear of the bolt carrier and the front of the recoil buffer once the folding system is installed. The adapter creates a gap between the rear of bolt carrier and the buffer’s front. An included bolt-carrier extension must be attached to the rear of the carrier to fill this space and maintain contact with the buffer. This is easily accomplished with a flathead screwdriver and wrench, effectively making the bolt carrier longer to fill the gap. Without the extension in place, the bolt carrier would damage the gun and cause it to malfunction while reciprocating.

As it currently exists, however, the carrier extension must be removed in order to separate the upper and lower receivers for maintenance or repair. While I never plan to remove my bolt carrier in the heat of a gunfight, there are some serious malfunctions that do require opening the rear takedown pin—with the Law Tactical setup in place, tools are required to make that happen. If I were to change one thing on this kit it would be to make the bolt-carrier extension removable without use of tools.

With the adapter installed to permit folding, the author’s AR had its storage length reduced by 6.5 inches, making stowing his emergency carbine easier than ever. Stock deployment can be accomplished in the blink of an eye.

The included manual clearly states this system should never be fired with the stock folded. The intent of this kit is to provide a more compact means of storing your AR, not firing it from the hip. A spring-loaded finger locks into the bolt-carrier extension when the stock is folded, preventing it from moving rearward should the gun be fired in this configuration. Law Tactical has tested both 5.56 NATO and .308 Win. ARs with this system to verify they could withstand being fired with the stock folded, and in both cases the bolt carriers were effectively retained, but the Law Tactical hardware was damaged and unsuitable for further use.

I added the Gen 2 AR Folding Stick Adapter to my 5.5-pound Hoplite, bringing weight up to 6.25 pounds and stretching overall length by 1.25 inches. The biggest change can be seen in terms of storage space needed for the little gun. My carbine measured 32.5 inches long with the stock collapsed in the original configuration. After installation, overall length with the stock folded was shortened to just 26 inches.

I fired 150 rounds of 55-grain FMJ and surplus 62-grain M855 “green tip” through my gun with the Law Tactical adapter installed. Function was flawless, and though my length of pull was longer, the collapsible stock allowed me to easily remedy that problem out for a normal eye-to-sight distance. I checked the screw affixing the bolt carrier extension after every 10 rounds for the first 60 shots to see if it would loosen, then I fired the rest of the ammunition and checked again to ensure it stayed tight. The carrier extension was properly aligned and the screw was as tight as when first installed each time I inspected it.

We live in an age of utility through modularity. Selling for $199 (web) to $219 (MSRP), the Law Tactical Gen 2 AR Folding Stock Adapter adds yet another page to the practicality chapter in the book of America’s favorite rifle.

Daniel Defense Integrated Suppressed Rifle (ISR)

 

By CTD Suzanne
  

One reason why I love the AR-15 platform is how customizable it is. There are so many ways to trick it out for whatever your needs are—be it home defense, hog hunting, 3-gun or plinking. Some of the coolest AR-15s I have had the pleasure to shoot are suppressed and short barreled. Daniel Defense unveiled its latest AR-15 at Media Day—the Integrated Suppressed Rifle (ISR).

With the Daniel Defense ISR, you get both an SBR and a suppressed AR-15 with one tax stamp.

With the Daniel Defense ISR, you get both an SBR and a suppressed AR-15 with one tax stamp.

Daniel Defense put a non-removable 5.7-inch suppressor on a 10.3-inch barrel. Overall, it makes the rifles barrel a legal 16.1 inches. Daniel Defense built the rifle on a pistol-length gas system and made a custom gas block that also serves as the suppressor mount. The gas block is inside the suppressor.

Daniel Defense put a non-removable 5.7-inch suppressor on a 10.3-inch barrel

Chambered for the popular .300 AAC Blackout, Daniel Defense put a Magpul MOE buttstock on the ISR with its fixed sights, handguard and 12.0 modular float rail. The rifle ships with one 30-round Magpul PMag and a hard case.

Even though the suppressor is not removable, the monocore baffle is rifle for maintenance and cleaning.

Even though Daniel Defense has yet to release the sound reduction rating for its suppressor, rumor is it’s close to 30dB.

The ISR’s MSRP is $3,199 and delivery begins in April 2013.
We shot the ISR full-auto version and in the freezing temperatures during Media Day, the rifle was quite the hand warmer. The tolerances on the ISR are tight and it sounded like Daniel Defense’s other rifles outfitted with a Surefire Suppressor.

12.0 modular float rail

DPMS Tac-2

 

The DPMS Tac2 combines the longer gas system of a rifle with the shorter barrel of a carbine to make a strong case for the AR platform’s adaptability.

By Adam Heggenstaller (RSS)
December 13, 2012

Thanks to its building-block modularity, you can pretty much equip an AR for any situation—bad guys at 5 yards, prairie dogs at 500, zombies everywhere in between—limited only by your imagination. (With all the apocalyptic talk lately, perhaps “preparation” is a better word.) There is, however, one little detail that gets in the way: that fun-stifling thing known as your budget. Swap too many components and accessories around, and you will have thrown enough coin at one AR to have two.
 So in the interest of both economy and practicality, it makes good sense to have a single AR that can tackle a variety of tasks without having to change a thing about it. Avid students of the AR may already have such a rifle, but it likely took them several years of thinking and tweaking, buying and selling before arriving at the “ultimate.” The rest of us should simply check out the new DPMS Tac2, as it highlights the AR platform’s flexibility—with no parts swapping required.

 

The Long and Short of It
DPMS builds the Tac2 around a rifle-length gas system, which is the technical ticket to the carbine’s adaptability. The gas tube extends a full 15.125 inches from the carrier key before ending in the gas block. This provides two advantages: an appreciable increase in sight radius and a theoretical decrease in felt recoil.

The DPMS Tac2 comes with Magpul’s ergonomic MOE pistol grip and trigger guard, which is shaped to allow clearance for a gloved trigger finger.

Since the gas block also includes the front-sight post, positioning the assembly farther down the barrel adds several inches of distance between it and the rear aperture. The sight radius on a standard M4-style carbine with an A2-type front sight at the end of a carbine-length gas system is in the neighborhood of 14.5 inches. On the Tac2, however, the distance between the aperture of the Magpul MBUS rear sight and the front post is almost 20 inches, an increase of about 38 percent.

Unfortunately, this doesn’t mean you’ll be 38 percent more accurate with the Tac2. In general, though, a longer sight radius allows for a more precise sight alignment. Slight shifts in the position of the front-sight post relative to the rear aperture are more noticeable the farther the two are apart. It’s easier to spot misalignment.

Achieving a rifle-length sight radius with an A2-type front sight/gas block usually requires a barrel of 20 inches or more. But the Tac2 follows the trend set by “Dissipator” carbines by providing the sight radius of a rifle-length system on a handy 16-inch barrel—only with a substantial shift. Most Dissipator setups use a carbine- or mid-length gas system with a low-profile gas block hidden beneath a rifle-length fore-end. The A2-type front sight/gas block resides on the barrel where the gas port for a rifle-length system would normally be located, but it’s not actually part of the gas system. It’s only there to provide a front sight.

The A2-type front sight/gas block on the Tac2, however, is the functioning gas block, because the carbine has a true rifle-length gas system with the gas port located 13 inches down the barrel. This offers the potential for reduced recoil, as the pressure produced by expanding gases at the port of a rifle-length system is substantially lower than at the port of a shorter gas system. The force that the gases impart to the bolt-carrier group, and eventually your shoulder, is less violent. While felt recoil from an AR in 5.56 NATO isn’t exactly punishing, less of it means more control and faster recovery between shots.

A sling loop is pinned to the gas block, but a quick-detach setup mounted to the fore-end would alleviate undue pressure on the barrel when shooting with a sling.

That’s assuming, of course, the gas system functions reliably. The Tac2’s direct-gas-impingement operating system requires just the right amount of gas at just the right pressure to unlock the bolt at just the right time and initiate cycling. The location of the gas port plays a key part in this balancing act, and it is normally dictated by barrel length because of a factor known as dwell time. Dwell time is the period during which a fired bullet remains in the barrel after passing the gas port and before exiting the muzzle. While the bullet “dwells” in the barrel, the only place for the expanding gases to go is through the gas port and into the operating system.

Manufacturers traditionally pair carbine-length gas systems with carbine-length barrels and rifle-length systems with rifle-length barrels because reliability has been proven. A short gas system on a long barrel has the potential to be “over-gassed” due to high gas pressure at the gas port and increased dwell time. This could lead to excessive recoil, difficult extraction, broken parts and other headaches. The opposite is true for a long gas system on a short barrel—there may not be enough gas entering the tube at a high enough pressure to make the gun run. (Mid-length gas systems offer a compromise, but that’s another story.)

DPMS bucks the status quo and avoids potential problems by increasing the size of the gas port in the Tac2’s barrel from .070 inch in diameter to .113 inch. The larger gas port makes up for the lower gas pressure and shorter dwell time by allowing more gas to enter the system. It’s like the bolt-carrier group is being pushed with two hands instead of being slapped with one. Again, the advantage is a decrease in felt recoil, along with less stress on the bolt-carrier group.

Extended Benefits

The Tac2’s rifle-length gas system provides more room between the upper receiver and the gas block/sight tower for a fore-end. DPMS makes the most of it by giving the carbine a rifle-length M111 free-float tube. As far as looks go, the M111 fore-end is the coolest thing on the Tac2, but its length offers more benefits than can be appreciated by the eyes.

The Magpul ACS buttstock includes three compartments for storing essentials.

The M111 provides a wealth of options for mounting accessories without the added bulk of full-length rails. Less than 2 inches in diameter, the M111 is drilled and tapped to accept rail sections along its length at the conventional 3-, 6- and 9-o’clock positions. Additional rail-attachment points are located at the 1:30, 4:30, 7:30 and 10:30 marks toward the front and rear of the fore-end. Save for the integral, full-length top rail, you can add rails where you need them and remove them where you don’t, choosing from 22 locations in all. DPMS provides two, 2.5-inch rails and one, 4.5-inch rail with the Tac2.

Where you position the rails, of course, depends on what type of accessories you plan to add to the carbine, but the M111 fore-end also adapts to your shooting style or body size. For example, if you prefer to place your support-side hand at the far front of the fore-end, the M111’s extended length gives you plenty of surface area to grasp. Or, if you have short arms and like to use a fore-grip close to the magazine well, move a rail section to the rear of the fore-end.

Although rifle-length fore-ends typically weigh more than shorter versions, DPMS keeps the M111’s weight to a minimum with generous, oval-shaped cutouts. The larger ovals do double-duty by helping align the rail sections with the attachment points. They also work with the smaller cutouts to allow air to circulate around the barrel for cooling.

Reaching Out

The Tac2’s versatility outshined even the blazing sun during my test sessions. A couple friends and I started by hammering steel using the iron sights. We all enjoyed the benefit of the Tac2’s longer sight radius, especially on 8-inch squares of steel at 150 paces.

Eight rail-attachment points at the front and rear of the M111 fore-end provide numerous options for mounting accessories.

At close distances, the Tac2’s muzzle-heavy balance helped with control when transitioning between multiple paper targets. The carbine was responsive thanks to its compact overall length, but it didn’t feel “whippy” like some guns with thin, 16-inch barrels. Muzzle control was particularly apparent when, in the long shadows of the late afternoon, we switched on the LaserMax Uni-Max Green laser riding aboard the fore-end. Rarely did any of us sweep past a target and have to come back to pick it up. Certainly the Magpul ACS buttstock contributed to the Tac2’s handling, providing a place for a solid, continuous cheekweld while moving from target to target.

After cleaning the Tac2, the next day I mounted a Leupold VX-6 Multigun 1-6×24 mm scope, traded the fore-grip for a bipod and headed to the 100-yard line for accuracy testing. I was surprised to see the 1:9-inch-twist barrel handled 69-grain bullets as well as, and in some cases better than, 55-grainers. The overall group average for four loads was just shy of 1.5 inches.

Although the Tac2 turned in a respectable performance during accuracy testing, it also made its one flaw apparent. The trigger was, in a word, horrible. Its pull weight wasn’t unreasonable, but I wrestled with considerable creep and overtravel.

Naysayers claim a rifle-length gas system is too long for a 16-inch barrel. On the Tac2, it’s just right.

The carbine digested nearly 500 rounds of six different loads having bullet weights of 55 to 75 grains without a single failure to feed or function. Reliability is paramount whether your carbine is intended for personal protection or for competition. The Tac2 would excel at either of these missions because it’s both reliable and versatile.

It’s smart planning to have iron sights on your long gun and to know how to use them effectively.

The Tac2 gives you a set of irons with a healthy sight radius, plus the option of adding an optic. There is room to set up just about any accessory—several, actually—on the carbine’s fore-end the way you want it. Finally, you get the soft-shooting benefits of a rifle-length gas system with the maneuverability of a 16-inch barrel. The DPMS Tac2 may not be able to do it all, but its built-in adaptability goes a long way.


Manufacturer: DPMS; (320) 345-9223, dpmsinc.comAction Type: Gas-operated, semi-automatic
Caliber: 5.56 NATO
Capacity: 30 rounds
Upper Receiver: Forged 7075-T6 aluminum alloy
Barrel: Button-rifled, 4140 chrome-moly steel; 16 inches
Rifling: 6 grooves, 1:9-inch RH twist
Fore-end: DPMS M111
Lower Receiver: Forged 7075-T6 aluminum alloy
Trigger: Single-stage; 5.9-pound pull weight
Sights: Magpul MBUS flip-up rear, A2-type front
Stock: Six-position, collapsible Magpul ACS
Length: 34.25 to 38 inches
Weight: 8.5 pounds
Accessories: Two aluminum magazines, rail sections, nylon sling, polymer hard case
MSRP: $1,299

Elftmann Tactical: Dual Enhancement Trigger (D-TR)

 

The Elftmann Tactical Dual Enhancement Trigger combines the utility of a battle rifle trigger with accuracy-fostering characteristics of a designated-marksman rilfe in a single product.

By Bob Boyd (RSS)
October 26, 2012

Whether it’s the versatility of its modular design, enabling nearly infinite degrees of customization, or the ability to swap a variety of accessories and parts to the ballistic and economic advantages of a multicaliber conversion, there’s no need for a degree in mechanical engineering to understand why AR-platform rifles have captured the attention and hearts of so many firearm enthusiasts. But, aside from its plug-and-play design, virtually all mil-spec-configured variants shares a common and unnecessary Achilles heel—really bad triggers infested with accuracy-robbing characteristics like excessive take-up and grit-laden creep that makes for an inconsistent let-off.
 Far from a standard aftermarket black-rifle “bang switch,” the Elftmann Tactical: Dual Enhancement Trigger (D-TR) amps up the rifle’s wow-factor by creating the illusion of dual triggers arranged vertically in a semi-staggered orientation. The company’s website states the inspiration for the design stemmed from the trigger’s creator actively participating in paintball for more than a decade, during which he noticed how the guns evolved from having a single trigger to containing double triggers with much lighter pull weights. This fueled his curiosity, wondering why such a design had never been applied to actual rifles. Elftmann then partnered with a respected trigger manufacturer to produce a truly innovative product.

 

A first glance at the Elftmann D-TR caused my mind to conjure images of the single-shot breechloaders sporting double set triggers utilized by frontier-era buffalo hunters and long-range competitive shooters of long ago. In time, I discovered that comparison wasn’t too far off the mark. Yet, unlike Sharps rifles, the D-TR doesn’t actually contain double triggers. Instead, it contains a single that is extended with dual bows formed in the body to resemble two separate triggers. From a design standpoint, a single trigger means one less part to complicate an already battle-proven design. In addition, unlike other aftermarket triggers that utilize proprietary configurations, double-stage configurations and/or set-screws in order to adjust pull weight to achieve a consistent let-off, the DT-R achieves similar results through much simpler means—while remaining compatible with aftermarket or Mil-Spec components.

Although the D-TR resembles two triggers when installed, it's actually an extended single trigger. The additional leverage and your finger placement reduces the pull weight by 50 to 60 percent.

The light weight, U.S.-made product is made from both aircraft aluminum and hardened steel at critical-wear points. When installed, the upper portion of the DT-R has approximately the same pull weight as a stock-AR trigger. Therefore, when utilizing a standard-weight trigger spring, the average-pull weight of the top trigger is 7 to 7.5 pounds, which isn’t bad. But it gets better. The pull weight of the lower trigger is reduced by 55 to 60 percent—the byproduct of the additional leverage. Such a drastic difference is enough to make anyone from Archimedes to the casual AR tinkerer take notice.
While I admit being skeptical of the D-TR’s benefits at first, my experience with the product was quite positive. Not only was it easy enough for this gimpy gun writer to install, in the case of my AR, which contains a JP Enterprises Reduced Power Spring Kit, the pull weight of the upper trigger came in at 6 pounds, 8 ounces, and an extremely manageable 2 pounds, 11 ounces on the lower trigger. The presence of the pseudo second trigger didn’t affect my ability to quickly access the fire controls or the compromise the ergonomics of my rifle. Similarly, I didn’t experience any confusion resulting from the dual bows. When considering their placement in relation with my grip, and given the proximity of my middle finger with the lower bow, the pairing not only seemed logical, but surprisingly natural as well.

When discussing the benefits of the D-TR with Elftmann’s Director of Sales Ron Rupert, he informed me the overwhelming majority of people who have used the D-TR eventually resort to using their middle fingers on the lower-trigger bow for single, precision shots, reserving the upper-trigger bow for situations where rapid fire is needed. In fact, Rupert claims the D-TR provides shooters with the ability to shoot 20 percent faster, without experiencing the negative effects of muzzle lift. “It is really pretty simple—it is basic hand mechanics: You have more strength when pulling your index and middle fingers simultaneously, as opposed to just your index finger. This increased strength translates to your ability to pull the trigger faster…We believe that the D-TR is a great solution that allows the AR-15 user to increase the rate of fire, but not to the rate of generating muzzle lift. So, as opposed to a tactical officer using a fully-automatic weapon—we believe that there is an argument that would justify using the AR-15 with our trigger. It is a good balance between speed, accuracy and ammunition management.”

Unlike other triggers designed for use in AR-platform rifles, the D-TR is fully compatible with other aftermarket components. The author was pleasantly surprised when he discovered the D-TR reduced his JP Enterprises 6-pound pull just over 2 pounds.

Although, numerous aftermarket triggers abound for AR-platform rifles, the D-TR is the first one I’ve discovered that solves the platform’s inherently bad trigger through the simple concept of leverage. Moreover, not only does its appearance amp up the AR’s wow-factor, it adds an all-new level of versatility to America’s favorite rifle by offering the benefits of two triggers in one—without adding to the rifle’s parts count.

This product could potentially benefit a wide variety of firearm enthusiasts: from the typical black-rifle collector who scrounges local gun shows looking for the next piece of gear to clamp onto his already-festooned fore-end, to the casual tinkerer looking to improve his skills while bringing his rifle one step closer to perfection. The D-TR could also provide a huge edge to competitive shooters, especially within the highly popular realm of 3-gun with its complex stages that require engaging targets with precision at short, intermediate and long ranges. Of course, AR-platform rifles are also common today within the hunting community, and given the degree of precision required to harvest game in the quickest and most humane way possible, the accuracy-enhancing benefits associated with the D-TR’s ability to facilitate an accurate shot at 50 to 60 percent less than the rifle’s primary trigger would certainly be a welcome benefit to any sportsman’s seasonal pursuits. Then, there are firearm enthusiasts with physical disabilities, whose limited motor skills keep them from being able to successfully running a bolt-action rifle. By the very modular nature of its ergonomic design, an AR-platform rifle may offer a solution, thanks to a wide range of aftermarket components available—including the D-TR—providing a crisp, lightweight and manageable trigger pull for those with limited range of motion and strength. Similarly, the D-TR aids disabled veterans by offering the means to maintain their proficiency with a weapon system with which they are already familiar.

Naturally, the D-TR offers a tremendous benefit for current military and law enforcement personnel, as well.

By offering the advantage of having two triggers in one, the Elftmann Tactical: Dual Enhancement Trigger offers a simple solution to the AR-platform’s age-old problem of inherently bad triggers, while simultaneously enhancing the overall versatility of making America’s rifle, giving it a space-age aesthetic and making it perform even better. MSRP: $239.00; (602) 432-8775, elftmanntactical.com

The Best Time to Pull the Trigger on a Colt LE 6920—Figuratively and Literally

 

 By Dave Dolbee

 

Colt has consistently manufactured the M16/AR-15 longer than any other company. From the ‘60s Vietnam era M-16 to the current M4, Colt has also produced more AR-15/M16s than any other manufacturer. It has a history of working with the U.S. Government and setting the Mil-Spec standards for this platform. Simply stated, an AR from Colt is the standard by which all others are measured. In fact, you’ll often see the Colt 6920 referred to as an M4’gery, because it’s as close as you can get. The left side of the magazine well is even stamped “M4 CARBINE.”

From top to bottom: M16A1, M16A2, M4, M16A4

It’s beyond argument to say Colt’s LE6920 is one of the best out-of-the-box AR-15s available. Law enforcement officers and agencies across the country carry the LE6920 due to its reliability and performance—the civilian market highly regards it for the same reason. There are other top-rated ARs that compare favorably to LE6920—Daniel Defense, CMMG, Knight’s Armament, BCM and others immediately come to mind, but all come at a premium price compared to the 6920.

The 6920

Colt’s 6920 comes in two different models the LE6920 and SP6920. The models are identical except for the markings, which isn’t to say the marking is irrelevant. The LE6920 holds the distinction of wearing the following badge: “RESTRICTED MILITARY/GOVERNMENT LAW ENFORCEMENT/EXPORT USE ONLY.” These markings came about in the 1990s during the Clinton Administration’s Violent Crime Control and Law Enforcement Act of 1994. The so called assault weapons ban kept them out of our hands for 10 years until 2004 when the law hit its sunset provision and the rifles were again available to the general public. Colt was later able to offer this workhorse to the public, but sadly has discontinued the LE6920, while continuing to offer its twin brother, the SP6920.

This is your chance to not only own a great firearm, but a piece of history.

This is your chance to not only own a great firearm, but a piece of history. Personally, I must admit: I enjoy owning a weapon that is stamped with a government-mandated message saying I can’t be trusted with it. Beyond being an amazing rifle, it gives you a tremendous feeling of confidence in the product and the American worker. It’s a reminder to myself, and a message to my children, to heed our Forefather’s words:

“A well regulated Militia, being necessary to the security of a free State, the right of the people to keep and bear Arms, shall not be infringed.”

Although no great calamity has befallen the masses as a result of the Crime Bill’s demise, politicians will—sooner or later—make another run at restricting modern sporting rifles from the public. I would not put much faith that Obama—if reelected—or some similar politician wouldn’t again deem us unfit to own sporting rifles such as Colt’s 6920s. Either way, although several LE6920s have been sold, keeping and holding a firearm with unique markings often brings a significant premium a decade or two down the road. Models once believed common, have paid for second homes or a kid’s college education a couple of decades later. Whether the LE6920 will be one of these guns… only time will tell. However, you can rest assured, you’ll never lose money on one.

Features

Colt’s LE6920 starts with a high-strength polymer, four-position, collapsible stock on the lower receiver assembly and a standard, semi-automatic AR-15 trigger assembly inside. If you prefer a specific brand of custom trigger, no problem. The LE6920’s lower will accept any standard AR trigger assembly—that’s the beauty of a standard impingement AR-15/M4 with mil-spec parts and rails. You can throw any furniture your heart desires and wallet can support on or in it.
Something not seen on many of the ARs being produced today can be found under the M4 hand guards on the LE6920—double heat shields. That does not seem significant on the showroom floor, but it will after you burn through a couple of mags in quick succession. The muzzle compensator reduces muzzle climb and helps eliminate flash and dust signatures.
The upper has all of the standard features such as a forward assist, shell deflector and dust cover over the ejection port. More notable is the detachable carry handle—complete with A2 sights—and the 1913 rail (commonly referred to as Picatinny rails). This gives you the option to shoot it original or customize it to your linking. If you choose the latter, be sure to pick up a quality back-up iron sight (BUIS), which ranges from $60 to $200.

The two bolts securing the gas key to the carrier are staked. This is a key to ensuring the bolts don’t work loose.

The bolt and carrier are significant parts are critical parts for mil-spec requirements. When you look at the top of the carrier you’ll see the gas key. The two bolts securing the gas key to the carrier are staked. This is a key to ensuring the bolts don’t work loose. In truth it is found on many ARs, but certainly not all. The bolt is also critical and should be labeled “MPC.” Colt uses carpenter steel and tests each individual bolt to check for micro fissures or defects that could cause a failure down the road. As far as I know… Colt and FN are the only companies that fire a proof load on every bolt before it is inspected.
All this adds up to a top-tier patrol or sporting rifle with a 16-inch button rifled, chromed barrel with a six groove, 1/7 RH twist that’s suitable for all combat 5.56 ammo including the NATO M855/SS109 and U.S. M193. A previously mentioned, the bolt assembly is M16 grade—both the bolt and barrel are magnetic particle inspected for imperfections.

Parting Shot

To say Colt’s LE6920 M4 Carbine is the Gold Standard of AR-15s, would almost be an understatement. In fact about the only quasi-negative comment I have ever received on the 6920 was “Gee, that’s a nice gun, but I bought a clone for less.” If only they knew, what you now know…

Specifications:

Model: Colt LE6920 Semi Auto Rifle
Caliber: 5.56x45mm NATO chamber (accepts .223 Remington)
Barrel: 16.1″ chrome-lined, M4 barrel
Twist: 1:7″ RH twist, 6 lands and grooves
Magazine: 20 round removable box
Length: 32 inches, retracted – 35.5 inches, extended
Weight: 6.95 lbs

Features:

• Forged A3 flat top upper receiver with removable carry handle rear sight
• Gas operated, multi lug rotary locking bolt
• Anodized aluminum upper/lower receivers
• Standard A2 front sight base
• Two piece, black plastic hand guards with dual heat shields
• Black 4 position buttstock

 

AR - VS - AK

Which gun works for you? Leave a comment and let me know! If there is a different weapons system you prefer, feell free to tell me that to.