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223 rounds interchangeably without adjustment to the gas system.
M4a3 bushmaster barrel size full#
The Bushmaster XM-15 is chambered for 5.56 NATO cartridges, which allows you to safely fire both full power 5.56 or lower powered. The 1:9" twist rate is fast enough to stabilize heavy bullets like the 69gr match rounds, while still capable of accurately firing standard 55gr ball ammo. The heavy profile 16.1" 4150 chrome moly steel barrel is then chrome lined to make it less susceptible to fouling, reduce corrosion and enhance feeding. Similarly, the gas key has been properly staked to the bolt carrier. The XM-15's bolt has been magnetic particle inspected, shot peened and pressure tested to ensure that it's structurally sound and will not fail. However, everything else about the Bushmaster is mil- spec. The buffer tube dimensions are those of the smaller diameter commercial spec.
M4a3 bushmaster barrel size free#
For semi- automatic rifles with a barrel length of 16" or greater, impingement AR-15s are lighter, easier to free float the barrel, and much less expensive to manufacture.Ī 6- position collapsible stock allows the shooter to adjust length of pull to their personal preference, while the carbine length handguard provides steady handling. This gas system unlocks the bolt and begins the cycling process, but only after the bullet has exited the barrel.ĭirect impingement has several advantages over gas piston systems. From there, the gas tube funnels into the bolt carrier. The gas then rushes into the port and down a gas tube located above the barrel and into the upper receiver. Gas is tapped from the barrel as the bullet passes by the port located above the rifle's front sight base. The model XM-15 is Bushmaster's designation for their AR-15 rifle.Īt the heart of the design is a direct gas impingement system. While these early rifles are now rare and extremely collectible, Bushmaster quickly abandoned the design and instead adopted a standard AR-15 operating platform. This has not always been the case as Bushmaster originally began in the early '70's by using steel uppers with an AK-47 style gas system. The XM-15 M4-A3 Heavy Barrel Carbine is a Colt / ArmaLite pattern rifle, which means it is completely interchangeable with standard AR-15 parts. These are the same folks that own Remington, Marlin, DPMS - among others. Founded in 1973, Bushmaster is a firearms manufacturer based in North Carolina and now owned by the Freedom Group. Low prices on the XM-15 LE M4-A3 Heavy Barrel Carbine start at Champion Firearms-ĭefending Freedom Around the Globe.