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The M4 carbine (officially Carbine, Caliber 5.56 mm, M4) is a 5.56×45mm NATO assault rifle developed in the United States during the 1980s. It is a shortened version of the M16A2 assault rifle.
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 standard M4 Type Carbine features a permanently fixed "Izzy" flash suppressor attached to a 14.5 in (370 mm) barrel, which brings the barrel to a total length of 16 in (410 mm). Bushmaster also produces the Patrolman's Carbine variant which features the more common removable "bird cage" flash suppressor, attached to a 16 in (410 mm) barrel ...
Barrel length: 40 calibers (3 m) Muzzle velocity: 619 m/s (2,031 ft/s) with M72 AP shell; M4. The 75 mm aircraft gun M4 is a modification of the M3 gun found in medium tanks. It differs from the M3 gun, only in having a seat for the spline machined in the tube. It was mounted on the M6 mount. T13E1 / M5
The M4's 14.5-in. barrel length reduces muzzle velocity to about 2900 ... but the core of the Mark 12 SPR is an 18" heavy barrel with muzzle brake and free float tube
A variant without a water jacket, but with a thicker-walled, air-cooled barrel was designated the M2 HB (HB for Heavy Barrel). The added mass and surface area of the heavy barrel compensated somewhat for the loss of water-cooling, while reducing bulk and weight: the M2 weighs 121 lb (55 kg) with a water jacket, but the M2 HB weighs 84 lb (38 kg).
The design appeared as the T6 pilot model: it proved acceptable to U.S. Army officials and production was ordered for the new "M4" on 5 September 1941. Before production on the M4 ramped up, however, the M4 design was further revised to include a heavy-barrel .50 BMG M2 Browning on the turret for anti-aircraft
The M2, designed with the same heavy barrel and bipod, also features a belt-fed drum mounted on top of the gun. [7] In February 1965, Colt submitted the Model 606A for the Small Arms Weapons Systems Trials (SAWS trials), sponsored by the U.S. Army, and would be known by the experimental classification as the GX–5856/Heavy Assault Rifle M1. [8]