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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.
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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
M4A1 (cast hull). Note the rounded edges of its fully cast upper hull. Variants from the M4 and M4A1 share the same 9-cylinder radial engine profile. M4A2 M4A2 HVSS. M4A3E2 "Jumbo" with an extra inch of cast armor in the frontal hull. M4A3E8 "Easy Eight" at the Patton Museum of Cavalry and Armor, 2003. M4A4.
M4/M4A1 – Mostly being replaced by M27 in infantry battalions. Commonly issued for non-infantry marines as of 2010. [7] M27 Infantry Automatic Rifle – Support weapon based on the Heckler & Koch HK416 (itself a piston-driven variation upon the AR-15) using a free-floating barrel. Initially issued as a replacement for the M249, in 2018 the ...
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.
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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