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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. The M4 is extensively used by the US military , with decisions to largely replace the M16 rifle in US Army (starting 2010) and US Marine Corps ...
The Bushmaster M4 [2] or M4A3 [3] is a semi-automatic or select-fire carbine size assault rifle manufactured by Bushmaster Firearms International, modeled on the AR-15. It is one of the Bushmaster XM15 line of rifles and carbines.
The M16 rifle (officially designated Rifle, Caliber 5.56 mm, M16) is a family of assault rifles adapted from the ArmaLite AR-15 rifle for the United States military. The original M16 rifle was a 5.56×45mm automatic rifle with a 20-round magazine.
Colt has been the most visible producer of ArmaLite AR-15 pattern weapons, and the military designations M16 and M4 are heavily associated with the company. Colt has an intricate internal nomenclature system for its models, with a variety of suffixes and prefixes.
Caliber: 5.56mm: Action: ... The Remington R4 is a firearms platform based on the AR-15/M16/M4/M4A1 series designed and manufactured by Remington Arms. [5] [6] Design
The M4's 14.5" barrel length reduces muzzle velocity to about 2900 ft/s. [193] This reduced wounding ability is one reason that, despite the Army's transition to short-barrel M4s, the Marine Corps has decided to continue using the M16A4 with its 20″ barrel as the 5.56×45mm M855 is largely dependent upon high velocity to wound effectively.
M4, and M4A1 (shown), the first Shermans, share the inverted U backplate and inherited their engine and exhaust system from the earlier M3 Medium Tank. Most Sherman sub-types ran on gasoline. The air-cooled Continental-produced Wright R-975 Whirlwind 9-cylinder radial gasoline engine in the M4 and M4A1 produced 350 or 400 horsepower (260 or 300 ...
The new cartridge was intended to negate many of the perceived drawbacks inherent to other large caliber cartridges used in the M4. Colt Firearms and other arms makers had previously chambered AR-pattern rifles and carbines in various .30 caliber rounds but encountered problems. In the case of the 7.62×39 mm, its relatively severe case angle ...