On the other hand, fluting can relieve manufacturing stresses in the steel. 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 government profile barrel is also compatible with the current M203 mounting systems. The bore was not chromed. The date-code on my original SOCOM barrel was “11/03” and the date-code on my newer SOCOM barrel is “02/18”. The fact is that a great deal depends on the depth and width of the flutes, since deeper flutes create more surface area. A fatigued gunner is a less accurate and less useful gunner. This group was fired off of sand-bags using match-grade hand-loads and a high magnification scope. 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. While they’re generally considered pretty heavy to pack around in the field (military, hunt, or even 3-gun), they’re great for bench target shooting and long distance precision shooting. After the gas port it gets heavier, out to the muzzle. {"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). Of course, the more rigid barrels resist “whip” far better than the slim lightweight barrels, another reason to choose them when high accuracy is your main criterion. Does your original barrel still shoot pretty well after all this time? Colt SOCOM barrel AR-15 Barrel Profile: A2 Government vs M4 style? 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”. You want this barrel, really, if you want a barrel that you can take anywhere, this is the one. We’re going to get into AR-15 barrel profiles. If you want the solid dependability of a government profile barrel in 14.5 or 10.5-inch lengths, we have them too. Great article. Just what I needed! 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. A nice and tidy overview of AR barrels, and without a lot of nonsense. A2 style muzzle brake. You’ll see “varmint” barrels mentioned here and there. 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. Thanks! 2) Weight can be your enemy or your friend, and where the weight is located matters. 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. This 10.5" barrel chambered in 9MM has a beautiful government profile and is milled from 4150 Chrome Moly Vanadium Steel. The extra thickness near the muzzle has no measurable difference in accuracy, even in rapid fire. Part 5: Surface Treatments and Muzzle Types. 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. 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. 16" 5.56 / .223 ar-15 1x7 ballistic advantage m4 profile carbine length barrel - modern babl556014m retail: $160.00. Unfortunately, I no longer own that barrel. As a side note, the pic below shows what a great job Ken Elmore of Specialized Armament does on his pin and weld jobs. 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. 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. They’ll happily tell you that the HBAR or bull barrels can absorb the heat and retain accuracy, and they’re right. (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. You can’t achieve either of those things by removing material. 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”. Anderson.300 Blackout AR-15 M4 Profile Barrel Government Cut - Same as the M4, but lacks the grenade launcher cut. There’s another thing to think about — the barrel’s mass acts as a heat sink. (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. After the gas port it gets heavier, out to the muzzle. The next pic is a close-up comparing the two barrels in the area between the chamber and the gas block journal, showing you were the extra weight is added. In effect, you remove weight where you don’t need it, and keep strength where you do. There is also the “Government” profile found on the M16A2, M4 carbine, and many civilian rifles. In the beginning, Eugene Stoner created the AR, which was upgraded to selective fire and named the M16 by the US Government. 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. 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. Beyond these come the true heavyweights – the HBAR (heavy barrel) and the even heavier bull barrel profiles. You must log in or register to reply here. 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. In Barrett’s defense, they didn’t sell it that way; it was fluted by an aftermarket gunsmith.). Click here to snag a copy. 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