And to make matters worse, there were early production, mid-production, and final version of some of the variants. 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. M4 barrel is light under the handguards and has a notch for mounting a M203. I built the M4 myself and I made sure all the tolerances were correct. M16A4 has a 600 meter effective range. The good idea is that the round, presented at a lower plane, will contact other lower feed ramps and go right on in. Ideally, tool steels would contain as much carbide volume as needed for the desired wear performance. Buying a Complete AR15 A2 Upper Receiver. What is the difference between an AR-15 A1 vs. A2 Lower? The M4 was produced in the 1990s at the request of the US Special Forces, which is a version of the M16A2, designated M4 Carbine. A2 vs A3 Specification - Whats the difference ... including the M4 carbine. M4! Subscribe to our monthly Newsletter to receive firearm news, product discounts from your favorite Industry Partners, and more. The M4 was the original “official” carbine version of the M16 and was, as I recall, adopted in 1994. All Rights Reserved. I only discovered this recently so I thought I would share. PM-M4 provides an outstanding balance of toughness, wear resistance, and tensile strength, and will perform in the most demanding applications. A forum community dedicated to Glock firearm owners and enthusiasts. An M4A1 in the hands of a United States Army Soldier. 1,895. I dont care for the collapsible stocks and love the look of the full size rifles. [ARCHIVED THREAD] - Difference between A2 and M4 Barrel Profile, https://www.youtube.com/watch?v=Jmi3SzkOIiQ, http://i1011.photobucket.com/albums/af233/avenger1970/AR15%20Photos/20170109_231528.jpg, https://www.ar15.com/forums/t_3_128/690199_Barrel_and_Gas_Types.html#i7104609. To start, let’s talk a little bit about the history of these two rifles to get a sense of their purpose. Hopefully someone can dumb this down for me and explain it. For a better experience, please enable JavaScript in your browser before proceeding. Uses the 30 round standard magazine. The M4 barrel is lightweight under the handguards, until just before the gas port. AR-15 Barrel Profile: A2 Government vs M4 style? Civilian guns have to be 16" BEFORE any removeable muzzle-end device. Not to try and confuse things with all of this. At a first glance, the M4 looks like a shortened M16, and that’s exactly what it is (technically an A2 configuration with a shorter handguard, shortened barrel, and relocated gas block). Really depends. A2 977: M4 Carbine: 4th Generation M4 S-1-F: Flattop Yes Yes 5.56 NATO 14.5 in. Sep 14, 2010 #7. M4 1:7 Yes A2 991: Colt SMG: 4th Generation Short Ribbed S-1-F Flattop No Yes Generally, if you call the "thin-behind-the-gas-block, heavy-in-front-of-the-gas-block" barrel in any length a "Government profile, XX inches long" most people will know what you are talking about. A quick, and possibly somewhat inaccurate history may help... (Also note that the measurements for barrel thickness are under the handguard. This factor accounts for differences in wear resistance among, say, O1, A2, D2, and M4. Some folks do, but I don't. Suite 500, Troy, Michigan 48084 USA. error) mid length A2 will be really close to a military 20" A2 barrel, with approximately 4" removed between the chamber area and the gas block/fsb. So we shall flow a river forth to thee and teeming with souls shall it ever be. So about the only advantage of the A2 profile was to give the rifle a little more muzzle hang. What it is: CPM M4 is a "Crucible Particle Metallurgy" carbon tool steel, widely regarded as a "super steel" for its properties and performance. M4 1:7 Yes A2 978: M4 Carbine Enhanced: 4th Generation M4 S-1-3-F Flattop Yes Yes 5.56 NATO 14.5 in. The mil actually only specs “M4 feed ramps” for use in its M4s. The M16A2 has a 20-inch barrel with a firing range of 600 meters. Being the more modern weapon, the M4 is more modular. Posted August 27, 2009 in Rifles by Steve Johnson with 43 Comments Tags: army, m16, m4, Marines, military, rifle, rifles. The barrel extension and the receiver both have to have the cuts. If you're not loadin', you should be movin', if you're not movin', someone's gonna cut your head off and put it on a stick. Disadvantages: Relatively more difficult to sharpen than CPM 3V and predecessor tool steels like A2, not as tough as CPM 3V or CPM 4V. In the civilian world, the 16"(really 16.1" or so, as a caution against accidentally making it less than 16" due to mfg. Bushcraft could mean just woodcraft or a lot more. Harder to find in the true A2 configuration, but you can get exceptionally close with the Aero Precision A2 upper receiver for about $425.00. The M4 Patrolman Carbine also comes in A2 and A3 versions. However, an M4 barrel extension is dished more so the feed ramps could extend downward, and then an area within the upper is shaped to match. ", Outdoor Hub, LLC (d/b/a Carbon Media Group), 3290 W. Big Beaver Rd. Besides, the A2 is still an inch shorter than the 20" shotgun I use for HD. Otherwise, I would vote A2. But the M4 certainly wasn’t the first attempt to configure the rifle for a specific application – it was the result of half a century of learning. Advantages: Relative toughness, wear resistance. A2 and A4 bolts come in different metric classes. After the gas port it … If you run the A2 wet it functions well but the M4 runs wet, dry, or full of dirt and it will usually function. Some really good reading appreciate the help and your time responding. D2 is the hardest to sharpen. An older-version (or A2-style) feed ramp is cut only on the barrel extension itself (top). AR15.COM is the world’s largest firearm community and is a gathering place for firearm enthusiasts of all types. Engine. M2 vs A2 Buttons Stamping modern materials does not only require superior punch performance. Raining. Carried the M4. The M4 is a shorter and lighter variant of the M16A2 rifle, with 80% parts commonality. You can’t tell the difference by looking but take them both to the range and you can see the difference. I prefer the rifle-like feel of the A2 myself. Too many to cover. I'd say for defensive uses, no. Need to clean cut hanging 1" manilla rope? A military M4 barrel is similar to a 20" A2 barrel, with about 5.5" removed between the chamber area and the gas block/fsb, M4 feed ramps, and a short section ahead of the gas block reduced in diameter to accommodate mounting an M203 (usually called the M4 cut). Copyright © 1996-2021 AR15.COM LLC. I would say that a M-4, especially if you've put some optics on it, is probably a better choice, than an A2, in … If you’re looking for something a little bit different from the … Is the ground still hard if the shove is friendly? Outside the house, and in the MOUT environment, the A4 is a superior firearm. Split the difference and build a 16" or 18" precision rifle (I have a soft spot for a scoped, SS-barreled AR):supergrin: Both configurations have their place, but I prefer the M4 set up overall. Black Rain Ordnance Flash Suppressor. This will include the 20″ A2 barrel, a 1-7 twist, chrome lined barrel, and fixed front site. For example, a bolt marked "A2-70" is a 304 stainless steel bolt with a … A2 style muzzle brake. Personally, I do not prefer the M4 notch/cut-out in the barrel for the grenade launcher. O1 probably the easiest to sharpen. Military M4 barrels are 14.5", with the standard A2 flash hider attached bringing OAL to about 15.5". FL CCW Permit holder since 1991- C&R FFL Holder since 2007, "If you're not shootin', you should be loadin'. Based on looks. Any use of this content without express written consent is prohibited. However! The problem isn’t the problem, pointing out the problem is the problem. In fact “solid carbide” tooling is typically 85% or 90% tungsten carbide particles, in a matrix of 10% or 15% cobalt to hold them together. They might not be exact if you measure with calipers at other points along the barrel, but it's close.). 06-26-09, 08:36 #9. Takeaways. Oh boy. It is illegal for a regular civilian to have the grenade launcher anyway, so why have the notch? The M16 was designed in 1956 and replaced the M14 as the U.S. military's standard service rifle in 1969. forces in the Korean War. I really tried to talk myself into a 16" recently, and the mid-length was tolerable, but they just seemed too small for a rifle and too big for a true submachine gun, particularly since they don't have a happy switch. OK so I'm a little confused about the differences in barrel variations of the following barrel profiles. The class depicts the tensile strength of the bolt divided by 10. Aside from working at Colt, he wrote the book (literally) on them. The A2 style buttstock is also good for cracking heads. I also have an M4. Commercial versions of the A2 often feature barrels with 1:9 twist rates adn heavy profiles under the handguards. There is an interesting article at Human Events about the US Army culture favoring the M4, while the Marines culture being pro-M16A4. Thanks for the help and all the information appreciate you taking the time to share and help! The M4 came along as a carbine for airborne troops and … Inside a house, and at CQB distances, the M-4 is a superior firearm. The rifle-platform M16s don’t use them. I prefer a rifle. This was noted by most all the Operational Test participants, especially when they fired the standing/off-hand leg of our rifle qualification course. With a QUALITY barrel and a nice optic you can do some accurate longer range shooting. Not necessary from a functional standpoint though. M4 and A2 Feed Ramps. The dual aperture rear sight system on the A2 carbines affords wind and elevation adjustment. From hunters and military members, to competition shooters and general firearm enthusiasts, we welcome anyone who values and respects the way of the firearm. For now my LE6920 will have to get me through the apocalypse for now lol. Tracing it’s roots to the compact XM177 and the GAU-5 of the Vietnam war, the M4 began development in 1984 and was officially adopted in 1991. Best for what use? M4 Carbine: Unique Role and Adoption. A selection Daniel Defense M4 AR15 Barrels demonstrating the Government profile. Another option if you still want an adjustable would be to look at magpuls ACS-L as it is longer than a m4 stlyed stock and locks up tight to the receiver extension unlike the m4, it too can take an extended butt pad for added length too but doubt you will need it as extended length of pull is … NOT FOR REPRODUCTION-contains hopefully illegible copyrighted material. CPM M4. It’s rare now to find an upper receiver or a ready-to-go barrel that doesn’t have the M4 cuts. Power hath descended forth from thy hand, that our feet may swiftly carry out thy command. 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. Short answer: The M4 has a three-round burst mode, while the M4A1 has a full-auto mode. The bolt type and metric class is usually marked on top of the bolt head, for instance "A2-70." In the recent conflicts in Afghanistan and Iraq, long-distance engagements have been the norm, so every meter matters. Robb Jensen. As with all other A3s, the carry handle can be removed and a massive array of sights (red dot, … JavaScript is disabled. I suppose it does give the rifle more of a military appearance, if that is important to some. In nomine Patris, et fili, et Spiritus Sancti. So you've been training on the M4 for five years, been through several courses and you decided that you like a 20" A2 HBAR? I prefer A2's as well - they feel more natural. Fuel, Cruising range. Development of the M16 required several iterations because of bullet design, firing modes, and structural reliability.The M4 came … "Better" is subjective. The emergence of the Russian AK-47 forced a redesign of the M14 to increase firepower and dependability, resulting in the adoption of the M16 during the Vietnam War. When you finish speaking, don't forget to wipe. For example, my "M4gery" has a Bushy 14.5" M4 barrel with a permanently-mounted, 1.5" long "Phantom" flash hider which makes OAL the legal 16". I have a few ARs already, both carbine length and mid-length, all with the 16" barrel. AFAIK, there is no US military standard for a 16" barrel. One of these days the youngins are going to realize that not all wars are to be waged inside a city. Come join the discussion about optics, gunsmithing, styles, reviews, troubleshooting, accessories, classifieds, and more! The A2 fire control group was modified to do away with full auto fire in favor of a three round burst mode. The M4 and M4A1 rifles have a flat top Picatinny rail upper receivers. If you want uncompromising fixed blade toughness AND wear resistance you want 3v or (this might come as a shocker) some good old A2. "And Shepherds we shall be. Thanks think I got it. And that is the important thing! I love the A2 style rifles. I will have one in my collection some day. There is no M4A2 or A3 (not in the government inventory), although there are M16s up to A4. For shooting small groups at long ranges, hunting, or similar uses, then perhaps. For thee, my Lord for thee. AR15.Com reserves the right to overwrite or replace any affiliate, commercial, or monetizable links, posted by users, with our own. Or CPM-D2, CPM-3V or CPM-M4. Amen.". A 20" 5.56mm barrel has several key advantages over the common 16" barrels. The world of the military M16 and, by extension, the civilian AR-15 market, has become dominated by M4-style firearms. M4 feed ramps will be up to the mfg. Army M4 vs. Marine M16A4. There is no blanket best steel. The M4 has several improvements. I like the A2 flattop. Stick a bayonet on the front end and it makes for an effective spear. The M4 and its variants fire 5.56×45mm NATO (and .223 Remington) ammunition, and are gas-operated, magazine-fed, selective fire firearms with either a multi-position telescoping stock or a fixed A2 or LE tactical stock. Oct 13, 2006. I prefer the look of the A2 over the M4 but I have to be honest.....my Colt LE6920 is AMAZING!!!!! If you want to learn a lot about the history of the armalite rifle I recommend checking out Christopher Bartocci on YouTube. This means greater hit probability at longer ranges. The main difference between the A3 and A4 is that the latter includes M4-style feed ramps, which serve the purpose of complementing the feed ramps found on an M4 barrel. Carried the A2 a bit too. All of the M4 family of rifles have a 14.5 inch barrel length with a carbine length gas port system. The biggest difference in the two barrels you describe is that the "A2" profile is a midlength gas system. I too am fairly new to the AR15 family of firearms and have learned a lot, and have a lot to learn. M4 1:7 Yes A2 979: M4A1 Carbine: 4th Generation M4 S-1-3: Flattop Yes Yes 5.56 NATO 14.5 in.

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