Anderson.300 Blackout AR-15 M4 Profile Barrel Government Cut - Same as the M4, but lacks the grenade launcher cut. 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. There is also the “Government” profile found on the M16A2, M4 carbine, and many civilian rifles. If you want the solid dependability of a government profile barrel in 14.5 or 10.5-inch lengths, we have them too. 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. 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. 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. We sent three of them to Adco Firearms to be dimpled, fluted and turned down to a lightweight contour. The government profile barrel is also compatible with the current M203 mounting systems. There are other options available too, not from double star, but you might consider lightweight, or gov. You’ll see “varmint” barrels mentioned here and there. A genuine SOCOM barrel has the typical M4 circumferential cut-out located approximately 1.4” forward of the gas block for the attachment of an M203, as well as rectangular shaped cut-outs underneath the hand-guards on the port and starboard sides of the barrel, located approximately 1.4” aft of the gas block, for the same reason. 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″. Shooting a rifle generates a great deal of heat, and the barrel absorbs a lot of it. 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. 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). Yes, lightweight barrels heat up faster, and the groups will open up, but usually we’re talking about a change on the order of 1.5-2 MOA accuracy opening up to 3 or maybe 4 MOA. 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. What’s important here is called “moment of inertia,” which is how a physicist says that it’s easier to rotate a 10 pound dumbbell in your hand than a 10 pound barbell. 16" 5.56 / .223 ar-15 1x7 ballistic advantage m4 profile carbine length barrel - modern babl556014m retail: $160.00. 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. News, special offers, exclusive discounts, and more! Ya don't need a M4, unless you have an old fashioned grenade launcher. What you can do is improve the ratio of strength to weight by carefully removing material in selected areas. The 20" barrel gives you 5.5" more sight radius (14.5" vs 20"), which is a 40% increase. {"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). 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. This 10.5" barrel chambered in 9MM has a beautiful government profile and is milled from 4150 Chrome Moly Vanadium Steel. Notice how the government profile starts narrow swells out for the gas block, and then remains heavier out to the muzzle. 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. Hey guys! I've never had any rifle string on me (even my FAL). See the advantages of BCM Enhanced Profile Barrels. The M4 barrel is lightweight under the handguards, until just before the gas port. As a side note, the pic below shows what a great job Ken Elmore of Specialized Armament does on his pin and weld jobs. 1. JavaScript is disabled. Some people will tell you that fluting makes a barrel stronger or more rigid. Discussion in 'AR-15 Discussion' started by blakeforeal, Oct 7, 2014. Another profile very much like the M4 is called the “government” profile: Basically the same, but without the M4 cut. If the hordes of zombies are so close that you’re dumping magazines at them, an increase from 2 to 3 MOA accuracy won’t substantially affect your hits, and you’d be far better off taking carefully placed head shots anyway. 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). That’s why a lighter barrel might cost more than a heavier one — you’re not buying steel by the pound. 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. 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. Varmint rifles tend to use very heavy barrels, usually 20-24″ long, and are generally made in stainless steel with a target crown. A cooler barrel expands less, and it remains more accurate. 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. 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. But first, some notes from your physics class: 1) Heat is the enemy of accuracy. Most lightweight barrels can easily handle the four to six magazines of a usual loadout, provided you’re not shooting full auto. These barrels are meaty, big cylinders of steel devoid of any lightening in their profiles. 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. On the other hand, fluting can relieve manufacturing stresses in the steel. The shooter’s forward (usually left) arm is placed through the loop and it’s pulled tight around the biceps area. 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”. Thanks! 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. 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. The Skinny (and Fat) on AR-15 Barrel Profiles. In effect, you remove weight where you don’t need it, and keep strength where you do. 14.5″ Pencil Barrel with Attached Muzzle [Review] Bu… 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. This has a skinny profile near the receiver and a thicker profile towards the muzzle. 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. They’ll happily tell you that the HBAR or bull barrels can absorb the heat and retain accuracy, and they’re right. 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. 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. Really informative summary. A fatigued gunner is a less accurate and less useful gunner. Moving toward heavier profiles, we come back to the Special Purpose Rifle (SPR) and Designated Marksman Rifle (DMR) barrels we discussed earlier. We should say we think that both guns are just about the same. Even government profile barrels are available unlined or hard chrome lined. The SOCOM barrel has a stripped weight of 1 pound, 14 ounces. 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. After the gas port it gets heavier, out to the muzzle. Some people like flutes because they look cool. As it heats, steel expands minutely, and groups on target can expand measurably. Oct 7, 2014 #1 . Unfortunately, I no longer own that barrel. Honestly looking for some opinions. A2 style muzzle brake. 2) The quick handling of single-point slings has made them the popular style on patrol in combat zones these days. For those complaining about weight, an M16A1 profile 20" barrel weighs almost exactly the same as a 16" M4 profile barrel. I could never understand why so many people offer M4 barrels as a selling point, especially when they're 16" and made of the incorrect steel. Those lightweight barrels were actually pretty good, and helped keep the whole weapon light. 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. 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. Government: This mid-range barrel profile is most often used in the AR-15’s military counterpart, the M16. M4 pertains to carbine only but "Government" profile pertains to the M4 and the M16. 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. Ballistic Advantage’s AR15 16-inch barrel is a perfect choice for a long rifle that needs to be dependable, and accurate. Thanks so much. 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. 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. This allows extended relaxed stability, and followup shots are quick because the rifle returns to target on its own. I have read all of your stuff; very informative. This is important for precision shooting – but less important for short-range or casual gunnery. The idea is long-range accuracy rather than a combat rifle. The stripped weight of the SOCOM barrel is 5 ounces heavier than the stripped weight of the standard Colt 14.5” M4 barrel. Let’s wrap up this section with a couple of practical thoughts on barrel profiles. The Government profile was an attempt to prevent the barrel from bending when used with a bayonet. 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. DS Arms manufactures our AR15 M4 M16 barrels from the premium 4150-11595E steel in a number of different barrel length, profiles and configurations. There’s another thing to think about — the barrel’s mass acts as a heat sink. Both test consisted of one 10 shot group? Your email address will not be published. Part 3: Caliber, Chamber, and Steel Types Original-style “pencil” or “A1” barrels are still available, though usually sold with a 1:7 twist and a chromed bore. 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. Choose an AR 15 5.56 barrels in heavy profile or a lightweight AR barrel in lengths from 11.5 to 20 inches. 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. 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. AR-15, M16, M4, 11.5",BCM Enhance Profile Barrels. The bore was not chromed. I’ve reviewed several of their barrels over the years and really like their stuff for the price point. M16A4 has a 600 meter effective range. The main categories, however, are the so-called government profile (standard) and then the lightweight version. 16″ Pencil Barrel [Review] 2. 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. 4 0 0. Just what I needed! 2) Weight can be your enemy or your friend, and where the weight is located matters. All of Del-Ton’s 16-inch AR barrel options use a mid-length gas system and are chambered to 5.56 NATO. some say that the m4 cuts mess with barrel harmonics...Shrug, I don't know, i haven't tested this assertion myself. Barrel Contours: Tale of the Tape. 3) Some shooters choose heavy barrels for their “SHTF” (stands for “civil unrest”, trust me!) Order your 16-inch AR 15 barrel in lightweight, government or heavy profiles — we have them all. Of course, that same moment of inertia will also stabilize the rifle a little better when it’s time to squeeze the trigger. Some people will tell you it’s significant, others will say the additional cooling is almost too little to measure. The rest of the series can be found at the links below: Part 1: Intro, Fundamentals, and Manufacturing of AR Barrels AR-15 Barrel Profile: A2 Government vs M4 style? blakeforeal New Member. .223/5.56mm Barrels for AR15 & M4 Rifles. You must log in or register to reply here. Colt SOCOM barrel 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. What heat they do absorb affects them less, enabling them to remain acceptably accurate at extended ranges. 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. 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 … Great article. So not all flutes are created equal – shallow ones retain more strength, deeper ones help with cooling. (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. The fact is that a great deal depends on the depth and width of the flutes, since deeper flutes create more surface area. It's finished in black nitride for a long lasting, performance product. You want this barrel, really, if you want a barrel that you can take anywhere, this is the one. After the gas port it gets heavier, out to the muzzle. They offer enough thermal mass to absorb a lot of shooting and remain rigid and accurate for a long time. weapon of choice, imagining pouring magazine after magazine of destruction on advancing waves of ravening Nazi Klingon zombies. ... A selection Daniel Defense M4 AR15 Barrels demonstrating the Government profile. AR barrels can be fluted before or after the gas block, but the gas port area itself is never fluted, due to the need for a full diameter at that point. 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. SOCOM vs. Standard M4 gov profile barrel. 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. Nice to see you over here as well. In 2010, I posted one of the first publicly available, in-depth. 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. The ELW barrel is available with fluting as an option for further lightening. For a better experience, please enable JavaScript in your browser before proceeding. The date-code on my original SOCOM barrel was “11/03” and the date-code on my newer SOCOM barrel is “02/18”. The solution is to free float the barrel, and mount the sling to the free float tube, leaving the barrel untouched. Molon, good to see you back up on the net. If you’re going to be carrying a rifle for extended periods, lightweight barrels can be your friend. 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. This involves disconnecting the butt end of the sling and pulling a loop into it. The gas port on a genuine SOCOM barrel has a diameter of 0.062” and the barrel employs a carbine-length gas system. 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. Part 5: Surface Treatments and Muzzle Types. But… how many magazines are they planning to carry? Their data showed that the M4 profile barrel actually outlasted the others. A visual comparison of a 16" Government Profile barrel (on top) and a 16" Lightweight Profile barrel on the bottom. Chambered in 5.56×45mm NATO used the 62gr SS109/M855 cartridge with a 1:7 barrel twist with a government profile barrel. Very informative, thanks for the great article. A 16" mid-length gas barrel has the proper spacing to mount a bayonet. Your articles are always much appreciated. That group was fired from my bench-rest set-up using match-grade hand-loads and a high magnification scope. Part 2: Barrel Length, Gas Systems, and Rifling AR-15.223 Wydle Government Barrel Heavy - Heavy barrels are thick from one end to the other and are, of course, literally heavy. 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. Two pounds at the end of a 1-foot bar exert the same 2 foot-pounds as one pound at the end of a two-foot bar. If there’s anyone that knows the AR-15 platform, it’s the US military. A heavier barrel contains a lot more thermal mass, which means the heat can be spread into more steel, heating the barrel less overall. -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 … Uses the 30 round standard magazine. 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. Required fields are marked *. It may not display this or other websites correctly. As a special offer for our readers, you can get the Official US Army Manual for AR-15/M4/M16 right now – for free. All their barrels are made in-house from “cradle to grave.” Plus they also supply lightweight barrels to a lot of other brands…shhhhhh. We carry QPQ treated barrels, Nitride Barrels and standard mil spec chrome lined barrels. (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. Does your original barrel still shoot pretty well after all this time? Fluting increases cooling surface area, but also removes thermal mass, so the cooling gains are at least partly offset by lost thermal mass. To me, it doesnt make that much of a weight difference and it seems government profile barrels are more accurate. Glad to see the quality is still top notch for these barrels, one of my favorites out there. Recently, I assembled another upper receiver group based on the Colt M4A1 SOCOM barrel. On my newer SOCOM barrel has a wrap up this section with a target crown the same as a offer... Different barrel length, profiles and configurations steel by the pound length, profiles configurations... 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