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The standard XM-15 has a forged 7075T6 aircraft-grade aluminum upper and lower receiver. Barrels of XM-15 firearms have a heavy profile and are hard chrome-lined 4150 alloy steel or 416 stainless steel. [2] [4] In Bushmaster's 2016 sales brochure, all new-production XM-15s are stated to be supplied with a 4150 steel barrel. [5]
The rifle is available with four barrel lengths and can be easily converted from a standard rifle (with a 16.5 inch barrel) into a carbine (with a 14.5 inch barrel), into a compact rifle (with a 10.5 inch barrel), or into a designated marksman rifle (with an 18-inch barrel) without any tools. Barrel lengths of the two calibres are exactly the same.
HBAR: A barrel that in some portion is thicker than government-profile, usually underneath the handguards; M4: Government barrel profile with small portion reduced to 0.575 inches to mount M203 grenade launcher; M4 HBAR: M4 barrel with portion under handguard thickened for sustained automatic fire; Super Heavy: Special Colt bull target/match barrel
The M4, and its variants, is a lightweight 5.56×45mm NATO (and .223 Remington) caliber, gas-operated, magazine-fed, air-cooled selective fire AR-15-pattern firearm. Its gas operation consists of an internal piston (often incorrectly referred to as direct impingement ), [ 56 ] a rotating bolt, and bolt carrier that reciprocates into a receiver ...
In U.S. patent 2,951,424, the designer states: ″This invention is a true expanding gas system instead of the conventional impinging gas system.″ [105] The gas system, bolt carrier, and bolt-locking design is ammunition specific, since it does not have an adjustable gas port or valve to adjust the weapon to various propellant and projectile ...
The IWI Carmel is a short-stroke, gas-piston operated rifle chambered in 5.56x45mm, similar to the CZ BREN 2 and the FN SCAR-L.The free-floating barrel is chrome lined and cold hammer-forged, with a 1:7 twist rate and available in a variety of barrel lengths: 10.5", 12", 14.5" and 16".
The LSW has a boxy square handguard with a carrying handle and a vertical foregrip that can be used as a monopod. The LSW was made with no bayonet lug until 2001 [16] due to the original bipod. A new bipod attaches to the same barrel yoke as the carrying handle and front grip, so current LSWs are made with a bayonet lug.
The Close Quarter Battle Receiver (CQBR) [5] is a replacement upper receiver for the M4A1 carbine developed by the US Navy.. The CQBR features a 10.3 in (262 mm) length barrel (similar to the Colt Commando short-barreled M16 variants of the past) which makes the weapon significantly more compact, thus making it easier to use in, and around, vehicles and in tight, confined spaces.