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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.
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 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]
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 ...
M4 (5.56×45mm NATO) (the U.S. Army was upgrading and retrofitting their existing stock of M4 carbines to the specifications of the M4A1, starting in 2014 and was predicted to be completed by 2020) [needs update] Mk 18 Mod 0 CQBR (Close Quarters Battle Receiver) (5.56×45mm NATO) (USMC Recon, USCG DSF, USN SEALs, USSOCOM, and USASOC)
Colt Carbine (AR-15A2 Government Carbine) (Special export model with receiver block and large pin upper receiver) 3rd Generation Short Ribbed S-1 A2 Yes Yes 5.56 NATO 16 in. A1 1:7 Yes/No A2 R6530 Sporter Lightweight .223 3rd Generation Short Ribbed S-1 A2 Yes Yes 5.56 NATO 16 in. A1 1:7 No A2 R6550 AR-15A2 Government A2 Ribbed S-1 A2 Yes Yes
The evolution of German military rifles is a history of common and diverse paths followed by the separate German states, until the mid-19th century when Prussia emerged as the dominant state within Germany and the nation was unified. This article discusses rifled shoulder arms developed in or for the military of the states that later became ...
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 ...