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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.
Barrett was still selling its limited stock of the M468 but only as an upper receiver kit and not as a complete rifle up until 2010. [ 11 ] The M468 has been largely replaced by its upgraded version, the Barrett REC7 , which operates via a short stroke piston that minimizes the direct impingement rifle's issues with gases in the receiver. [ 9 ]
The Colt ACC-M (Advanced Colt Carbine-Monolithic) adds Colt's proprietary, monolithic Mil-Std-1913 rail system (quad rail) forward hand guard to the normal M4 carbine upper receiver. Colt M4 Carbines and Colt M4A1 Carbines can be easily and relatively inexpensively modified/upgraded into ACC-Ms by replacing the upper receiver, which is more ...
One variant was designed to tow the 90 mm anti-aircraft gun, and another was for the 155 mm gun or 8-inch howitzer. [1] The rear compartment carried the gun crew and other equipment and some later variants included a crane to assist with heavier projectiles. [ 1 ]
The Close Quarters Battle Receiver (CQBR) was originally a Special Operations Peculiar Modification (SOPMOD) program item that would increase the close quarters maneuverability of the M4A1 by mating the lower receiver with a 10.3-inch (262 mm) barreled upper receiver; with the CQBR installed, the weapon would then be classified as the Mk. 18 ...
A carbine (/ ˈ k ɑːr b iː n / or / ˈ k ɑːr b aɪ n /), [1] from French carabine, [2] is a long arm firearm but with a shorter barrel than a rifle or musket. [3] Many carbines are shortened versions of full-length rifles, shooting the same ammunition, while others fire lower-powered ammunition, typically ranging from pistol/PDW to intermediate rifle cartridges.
Service history; In service: 2012–present: Wars: ISIL insurgency in the Philippines Islamic State insurgency in Iraq (2017-present) Production history; Manufacturer: Remington Arms Company Government Arsenal: Produced: 2012 – c. 2020: Specifications; Barrel length: R4 Patrol/Operator/Enhanced: 11.5 in (290 mm) R4 Patrol/Operator/Enhanced ...
M4A1: 5.56×45mm NATO rifle (produced under contract from the U.S. Government since 2013 by FNH USA). [9] Mle 1930: Belgian variant of the Browning M1918, chambered in 7.65×53mm Belgian Mauser. Model 1949: Semi-automatic rifle / selective fire automatic rifle chambered in .30-06 Springfield, 7.92×57mm Mauser, 7.62×51mm NATO, and 7×57mm Mauser.