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The M4A1 carbine is a fully automatic variant of the basic M4 carbine. The M4A1 was developed in May 1991 and entered service in 1994; starting in 2014 the U.S. Army began upgrading all of its existing M4s to the M4A1 standard. [69] The M4A1 was the first M4 model with the removable carry handle.
A trademark dispute between Bushmaster and Colt's Manufacturing Company concerned the use of the "M4" name. The M4 was developed and produced for the United States government by Colt, which had an exclusive contract to produce the M4 family of weapons until 2009. [6]
M4A1, a variant of the M4 Carbine; M82A1, M82A1A and M82A1M, three variants of the American Barrett M82 rifle; M96-A1, a variant of the American Robinson Armaments M96 Expeditionary rifle; PSG1A1, a variant of the German Heckler & Koch PSG1 sniper rifle; Steyr AUG A1, a variant of the Austrian 5.56 mm assault rifle
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.
The Special Operations Peculiar MODification (SOPMOD) kit is an accessory system for the M4A1 carbine, CQBR, FN SCAR Mk 16/17, HK416 and other weapons used by United States Special Operations Command (USSOCOM) special forces units, though it is not specific to SOCOM.
M4A1(76)W – Upgraded with 76 mm M1 gun and large drivers' hatches. M4A1(76)W HVSS – Upgraded with widetrack HVSS, fitted with the 76 mm M1 gun. M4A1E9 – Late war remanufacturing featuring spaced out VVSS suspension, extended end connectors on both sides of the tracks.
The Grizzly I was a Canadian-built M4A1 Sherman tank with relatively minor modifications, primarily to stowage and pioneer tool location and adding accommodations for a Number 19 radio set. They used the same General Steel hull castings as late Pressed Steel -built M4A1(75)s, to include both the standard hull and the later ones with the armour ...
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 kW).