Choose barrel-only options, or have yours shipped with a barrel nut, front site base and a round handguard cap. They offer enough thermal mass to absorb a lot of shooting and remain rigid and accurate for a long time. We sent three of them to Adco Firearms to be dimpled, fluted and turned down to a lightweight contour. I have read all of your stuff; very informative. See the advantages of BCM Enhanced Profile Barrels. To demonstrate a variety of options, we obtained four identical standard 16-inch mid-length gas system barrels with government profiles (and 0.750-inch gas block) from Bravo Company USA. {"cart_token":"","hash":"","cart_data":""}, AR-15 Barrels: Caliber, Chamber, & the Best Steel Type for Your AR Barrel (Part 3), AR-15 Barrels – Surface Treatments & Muzzle Types (Part 5), AR15 Barrels: Profiles, Fluting, and Dimpling (Part 4). There are other options available too, not from double star, but you might consider lightweight, or gov. This is important for precision shooting – but less important for short-range or casual gunnery. Magpul Industries AR-15 Parts & Accessories, Part 1: Intro, Fundamentals, and Manufacturing of AR Barrels, Part 2: Barrel Length, Gas Systems, and Rifling, Part 3: Caliber, Chamber, and Steel Types, Part 5: Surface Treatments and Muzzle Types, The Best Budget AR15s – Optics Ready and High Value, Top Picks: Best AR-15 Scopes for Your Money, 3 Ways to Correct Cross Eye Dominance When Shooting. A visual comparison of a 16" Government Profile barrel (on top) and a 16" Lightweight Profile barrel on the bottom. Barrel life was something in excess of 9,000 rounds (keep in mind that's a 1:7 twist, shooting full auto=lots of heat buildup). Chambered in 5.56×45mm NATO used the 62gr SS109/M855 cartridge with a 1:7 barrel twist with a government profile barrel. -Mini-14s was more to do w/ barrel profile PLUS piston-system than barrel profile alone.-Anon at 5/13 #s and effects regarding M855 vs M193 are spot on.-Sling bending 20″ pencil barrel and affecting POI is real — and the same bend applies to gov’t profile barrels … Some will tell you it improves barrel cooling. All of the M4 family of rifles have a 14.5 inch barrel length with a carbine length gas port system. The rest of the series can be found at the links below: Part 1: Intro, Fundamentals, and Manufacturing of AR Barrels Part 3: Caliber, Chamber, and Steel Types All their barrels are made in-house from “cradle to grave.” Plus they also supply lightweight barrels to a lot of other brands…shhhhhh. The problem, if there is one, is that a sling mount on the barrel (such as under a front sight base) applies that tension directly to the barrel when used this way, potentially creating a bit of “whip” and shifting the point of impact. Click here to snag a copy. Simply put, a fluted barrel is one that has had material removed from the outer surface, generally in grooves that run lengthwise along part of the barrel. This makes an elegant and beautiful solution to optimizing the barrel; it’s a pity that most of it will be covered by a handguard. As a special offer for our readers, you can get the Official US Army Manual for AR-15/M4/M16 right now – for free. This group was fired off of sand-bags using match-grade hand-loads and a high magnification scope. Original-style “pencil” or “A1” barrels are still available, though usually sold with a 1:7 twist and a chromed bore. The ELW barrel is available with fluting as an option for further lightening. Of course, that makes it slightly heavier, but the difference is minimal. The USGI barrel profiles (often referred to as the Government Profile) enable the operator to carry their weapon for longer periods of time and deploy them faster than the heavier commercial H-Barrel counterparts. In 2010, my original SOCOM barrel with the “11/03” date-code produced a 10-shot group fired from a distance of 100 yards that had an extreme spread of 0.90”. But there’s another way to get lightened weight without much flexion, and that’s fluting, which we’ll discuss in a moment. The main categories, however, are the so-called government profile (standard) and then the lightweight version. A genuine Colt M4A1 SOCOM barrel is 14.5” long and has a. In 2010, I posted one of the first publicly available, in-depth. On an assembled URG (upper receiver group), the M4 barrel is identifiable by the “M4 cut” – and here we’re not talking about feed ramps, but rather a narrower “notch” in the barrel, forward of the gas block, used to mount the M203 grenade launcher. In summary: Lighter barrels are less fatiguing to carry; longer barrels are good for long-range shooting, and heavy barrels are best for bench shooting or extremely long range. Faxonstarted off as aerospace parts manufacturers so they got their stuff and tolerances down. 3) Not physics but economics: When a manufacturer starts with a barrel “blank” and turns it to a specified profile on a lathe, removing more metal = more time and tooling = higher cost to you, the buyer. The Skinny (and Fat) on AR-15 Barrel Profiles. The Navy Recce rifles have used barrels by premium custom makers like Krieger and Lilja, though other makers offer similar profiles to civilians under the Recce name. AR-15 Barrel Profile: A2 Government vs M4 style? The lightweight barrel profiles discussed above were usually designed for the common infantryman, shooting at relatively short ranges, and intended to deal reasonably well with rapid fire. 16" 5.56 / .223 ar-15 1x7 ballistic advantage m4 profile carbine length barrel - modern babl556014m retail: $160.00. For a better experience, please enable JavaScript in your browser before proceeding. After the gas port it gets heavier, out to the muzzle. Fluted barrels are simple in concept, but seem to be the source of a lot of misunderstanding and controversy. Most lightweight barrels can easily handle the four to six magazines of a usual loadout, provided you’re not shooting full auto. (There’s a photo circulating of a fluted Barrett .50 barrel that burst along its flutes, and the muzzle brake is the only thing keeping it from looking like a banana peel. The government's heavy-handed tactics threaten to undermine the legitimacy of the election. 1) We didn’t mention barrel “whip”; a term you’ll hear sometimes to describe barrel flexion while shooting, which obviously affects the point of impact. Let’s dispel a myth right here: Fluting a barrel does NOT make it stronger, nor does it make it more rigid. While most civilians don’t have M203s, the barrels are still used to create “M4gery” rifles modeled on the military weapons. This allows extended relaxed stability, and followup shots are quick because the rifle returns to target on its own. Of course, a barrel that’s fluted too deeply loses critical strength to contain the immense pressures, and it’s possible to flute a barrel deeply enough that it bursts. Very informative, thanks for the great article. Oct 7, 2014 #1 . Im looking to get a 14.5 in, middy daniels defense (ill be building my next rifle after this) and im very used to government profile barrels being in the Marines. So any part that’s narrower than that means more time on the lathe. Naturally, the M4A1 SOCOM barrel has M4 feed ramps. The rest of the sling, still connected to the forend of the rifle, is shortened until it applies tension between arm and rifle when the shooter relaxes. News, special offers, exclusive discounts, and more! It’s also worth noting that the profiles listed above aren’t the only ones available in AR barrels, just the most commonly available ones, and within those descriptions some include a number of variations. AR-15.223 Wydle Government Barrel Heavy - Heavy barrels are thick from one end to the other and are, of course, literally heavy. Some people will tell you that fluting makes a barrel stronger or more rigid. Those lightweight barrels were actually pretty good, and helped keep the whole weapon light. This leads to decorative embellishments like spiral fluting, or, further yet, diamond fluting, created by cutting spiral flutes first clockwise around the barrel, then counterclockwise. The military standard is 4 MOA, and that’s pretty much good enough to hit a man-sized target at 100 yards if you take the time to aim properly. Unfortunately, I no longer own that barrel. A nice and tidy overview of AR barrels, and without a lot of nonsense. Recently, I assembled another upper receiver group based on the Colt M4A1 SOCOM barrel. This profile uses a 1:8 twist to allow 77-grain rounds, and was designed at the request of Navy SEALs who found the 18″ SPR barrel too long for their purposes but still needed a high precision (sub-MOA) combat rifle. For point shooting, this is a significant advantage. Im building a AR-15 with a 16 inch barrel my question is what is a better choice as far as barrel profile The standard A2 Government profile or the M4 style. 1. M4 pertains to carbine only but "Government" profile pertains to the M4 and the M16. When it is used, the light barrel will probably easily handle as much ammo as you can comfortably carry. For our purposes, a gas block or muzzle brake further out on a 20″ or 24″ barrel will feel heavier than the same device on a 16″ or 14.5″ barrel. JavaScript is disabled. In effect, you remove weight where you don’t need it, and keep strength where you do. These barrels are heavier under the handguard and taper only minutely toward the muzzle, and that mass makes them both heat and cool more slowly. Great article. There’s one more point of fluting worth mentioning: Bravo Company’s ELW (enhanced lightweight) barrel begins with a gracefully tapered profile, which allocates mass and strength along the barrel’s axis appropriate to the pressure loads. Ya don't need a M4, unless you have an old fashioned grenade launcher. The most popular barrel profile now is the M4 style, sometimes a direct copy of the 14.5″ military M4 barrel, but more often slightly extended to 16″ for legal civilian use. Honestly looking for some opinions. profile. After the gas port it gets heavier, out to the muzzle. My original SOCOM barrel hand an “F-marked” front sight base. some say that the m4 cuts mess with barrel harmonics...Shrug, I don't know, i haven't tested this assertion myself. Moving toward heavier profiles, we come back to the Special Purpose Rifle (SPR) and Designated Marksman Rifle (DMR) barrels we discussed earlier. SOCOM vs. Standard M4 gov profile barrel. We should say we think that both guns are just about the same. Maybe it didn’t feel light to a recruit doing exercises with it, but it was a whole lot lighter than an M14 or M1 Garand. .223/5.56mm Barrels for AR15 & M4 Rifles. The M4 barrel is lightweight under the handguards, until just before the gas port. We have AR15 and M4 MELONITE barrels including pencil profile barrels, mid-length barrels, carbine barrels and pistol barrels for the .223 cartridge and the 5.56 NATO cartridge. That’s why a lighter barrel might cost more than a heavier one — you’re not buying steel by the pound. Discussion in 'AR-15 Discussion' started by blakeforeal, Oct 7, 2014. A Colt Socom barrel tested by Molon was capable of producing an 30 round average sub-MOA load with an extreme spread of .9 inches and a mean radius of .35. Barrel has 5.56 Nato chamber, 1/7 twist rate, M4 barrel extension, rifle length gas system, threaded ½ x 28 muzzle and Mil-Spec phosphate coated. Fluting also increases the barrel’s surface area, which means that there’s more exposure to cooling air – in effect, the sides of the flutes act a little like cooling fins. I’ve reviewed several of their barrels over the years and really like their stuff for the price point. 3) Some shooters choose heavy barrels for their “SHTF” (stands for “civil unrest”, trust me!) Notice how the government profile starts narrow swells out for the gas block, and then remains heavier out to the muzzle. Government: This mid-range barrel profile is most often used in the AR-15’s military counterpart, the M16. For those complaining about weight, an M16A1 profile 20" barrel weighs almost exactly the same as a 16" M4 profile barrel. Thanks so much. We’re going to get into AR-15 barrel profiles. Part 2: Barrel Length, Gas Systems, and Rifling They’re designed for slow, precise and methodical shooting – more like sniping, less like “spray and pray.”. Just what I needed! It’s been said that dimpling produces better thermal efficiency in shedding heat; of course, that would also depend on depth and surface area. Everyone agrees that it makes them lighter. Sniper’s Hide is a community of Snipers of all kinds, focusing on long range shooting, accuracy, and ballistics. DS Arms manufactures our AR15 M4 M16 barrels from the premium 4150-11595E steel in a number of different barrel length, profiles and configurations. Some people like flutes because they look cool. Both test consisted of one 10 shot group? Remember, 4 minutes of angle at 100 yards is about 4 inches, and most combat shooting has been done at ranges shorter than 100 yards. There is no benefit for an AR-15 to have an M4 profile barrel aside from historical accuracy (but even then, it needs to be a 14.5" barrel). It may not display this or other websites correctly. 4 0 0. weapon of choice, imagining pouring magazine after magazine of destruction on advancing waves of ravening Nazi Klingon zombies. Shooting a rifle generates a great deal of heat, and the barrel absorbs a lot of it. Take note that on page 2 he compares the SOCOM to two 16 inch m4 profile barrels which he noted performed basically the same as their 14.5 inch counterparts. What matters is the distance from the mass to the force applying the rotation – which can be measured in foot-pounds, a measure of torque, or twisting force. Uses the 30 round standard magazine. You are using an out of date browser. The gas port on a genuine SOCOM barrel has a diameter of 0.062” and the barrel employs a carbine-length gas system. The idea is long-range accuracy rather than a combat rifle. The theory is that you’re shooting prairie dogs and coyotes on your ranch (or similar shooting), or informal competition. Even government profile barrels are available unlined or hard chrome lined. I've never had any rifle string on me (even my FAL). The additional weight really doesn’t do much as a heat sink, since most of the pressure and heat is before the gas block, but it does help a little to stabilize the rifle for offhand shooting. This 10.5" barrel chambered in 9MM has a beautiful government profile and is milled from 4150 Chrome Moly Vanadium Steel. Many makers have their own preferred profiles, and some custom barrel makers will cut you a barrel in any profile you’re willing to pay for. The solution is to free float the barrel, and mount the sling to the free float tube, leaving the barrel untouched. The extra thickness near the muzzle has no measurable difference in accuracy, even in rapid fire. The shooter’s forward (usually left) arm is placed through the loop and it’s pulled tight around the biceps area. What heat they do absorb affects them less, enabling them to remain acceptably accurate at extended ranges. There’s also “dimpling,” machining a series of dimples along the barrel’s surface, making it reminiscent of a golf ball. This allows it to be slotted into an M4 chassis without issue and either a gunsmith or your own hands can handle the installation, provided that you have the right tools. In the beginning, Eugene Stoner created the AR, which was upgraded to selective fire and named the M16 by the US Government. But… how many magazines are they planning to carry? A2 style muzzle brake. Thanks! I learned so much on the type of barrel I’m looking for to upgrade my AR platform . This involves disconnecting the butt end of the sling and pulling a loop into it. Choose an AR 15 5.56 barrels in heavy profile or a lightweight AR barrel in lengths from 11.5 to 20 inches. But some shooters fall back on an older configuration, known to military shooters as the 1907 style sling, when precise long-range shooting is called for. The design is a compromise between weight for carrying and handling and muzzle velocity and heat absorption to optimize accuracy. If a barrel contains unresolved stresses from manufacturing it can expand unevenly or warp, which also affects point of impact (POI) as well as group size. In a survival scenario it’s more likely that your rifle will spend most of its time slung on your back, where the lighter weapon will produce less fatigue, and will be used only occasionally. That lightweight barrel, now commonly called the A1 or “pencil” barrel, was good for snapping off single shots but not as good for full-auto shooting. Ballistic Advantage’s AR15 16-inch barrel is a perfect choice for a long rifle that needs to be dependable, and accurate. Great article on AR-Barrels. Varmint rifles tend to use very heavy barrels, usually 20-24″ long, and are generally made in stainless steel with a target crown. As a side note, the pic below shows what a great job Ken Elmore of Specialized Armament does on his pin and weld jobs. We carry QPQ treated barrels, Nitride Barrels and standard mil spec chrome lined barrels. Of course, that same moment of inertia will also stabilize the rifle a little better when it’s time to squeeze the trigger. So I am currently on the market for a barrel to finish up my first AR build and I am torn between the SOCOM and Standard M4 gov profile barrels. Anderson.300 Blackout AR-15 M4 Profile Barrel Government Cut - Same as the M4, but lacks the grenade launcher cut. “Varmint” isn’t a specific profile; it’s more of a type of shooting. This barrel is also offered with straight flutes, which begin near the chamber, cut deep, but as the profile tapers the flutes become shallower until they end entirely. The pic below shows the difference between the standard M4 barrel and the SOCOM barrel. Next we find a profile often called “Recce” (military slang for “reconnaissance”). Colt no longer stamps an “F” on their front sight bases, but their newer front sight bases maintain the length of 1.98” from the top of the barrel to the shelf for the front sight post. 2) The quick handling of single-point slings has made them the popular style on patrol in combat zones these days. Your articles are always much appreciated. Our flagship AR15 M4 M16 barrels and the pride of our AR offerings are our Chrome Lined military clone barrels; these barrels feature a M4 contour, 1:7 twist rate, M4 barrel extension, 1/2x28 muzzle threading and are … Your email address will not be published. Does your original barrel still shoot pretty well after all this time? You can’t achieve either of those things by removing material. The Recce barrel is stainless, generally 16″ long with a mid-length gas system, and heavy under the handguard, where the extra weight does provide useful thermal mass. Both of these SOCOM barrels have the “O” stamp near the chamber portion of the barrel, indicating the barrel has a chrome-lined chamber and bore. Founded by Frank Galli in 2014, Sniper’s Hide has been offering informational videos, podcasts, and other support to it’s users in one location. The most popular barrel profile now is the M4 style, sometimes a direct copy of the 14.5″ military M4 barrel, but more often slightly extended to 16″ for legal civilian use. In this article, we will cover the different AR 15 Barrel Profiles and understand the importance of fluting and dimpling in AR 15 barrels. Barrel Contours: Tale of the Tape. Similar mission demands have otherwise made these very similar. There is also the “Government” profile found on the M16A2, M4 carbine, and many civilian rifles. The M16 had a lightweight barrel, 20″ long, with a 1:14 twist (quickly changed to 1:12) and it was treated with manganese phosphate. Their data showed that the M4 profile barrel actually outlasted the others. This has a skinny profile near the receiver and a thicker profile towards the muzzle. These barrels are meaty, big cylinders of steel devoid of any lightening in their profiles. Hey guys! At the request of the Marines the M16A2 was given a chromed bore and a heavier barrel profile forward of the gas block, mainly to minimize the chance of bending (one of the A1’s most common failures in close combat). The fact is that a great deal depends on the depth and width of the flutes, since deeper flutes create more surface area. Molon, good to see you back up on the net. Another profile very much like the M4 is called the “government” profile: Basically the same, but without the M4 cut. This matters when you remember that any barrel, no matter how slim, has to start with a blank at least the diameter of the gas block – usually either .625″ or .750″. The SOCOM barrel has a stripped weight of 1 pound, 14 ounces. My newer SOCOM barrel with the “02/18” date-code produced a 10-shot group fired from a distance of 100 yards that had an extreme spread of 0.93”. (Gov is M4 in the carbine) In a carbine with an M4 profile barrel it will either be 14.5 or 16 inches long, lightweight under the handguards, and there will be a notch cut into the barrel forward of the front sight for mounting a grenade launcher. That group was fired from my bench-rest set-up using match-grade hand-loads and a high magnification scope. The one big drawback to pinned and welded flash-hiders is that you're basically stuck with that configuration once it's pinned and welded. APOC Armory. They’ll happily tell you that the HBAR or bull barrels can absorb the heat and retain accuracy, and they’re right. This new build features a Colt cage-code marked M4 upper receiver, a Colt “C” marked bolt carrier group and a 13” Geissele MK14 M-LOK free-float hand-guard. This profile is now commonly called “A2”. Fluting increases cooling surface area, but also removes thermal mass, so the cooling gains are at least partly offset by lost thermal mass. Part 5: Surface Treatments and Muzzle Types. The result is that, when done right, a fluted barrel will be stronger in certain areas, and more rigid in certain axes, than an unfluted barrel of the same weight. A cooler barrel expands less, and it remains more accurate. Even my FAL ) out for the light M4 for general patrol.! By carefully removing material is most often used in the AR-15 ’ s anyone that knows the AR-15,. In black Nitride for a long time the legitimacy of the SOCOM barrel magazines are they planning to?! Target can expand measurably sling and pulling a loop into it for “ reconnaissance )! The muzzle ( on top, standard barrel on top ) and a high magnification scope and remains... Don ’ t need it, and ballistics barrels, usually 20-24″ long, where... 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