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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 Remington R4 is a firearms platform based on the AR-15/M16/M4/M4A1 series ... Close-up Remington R4 rifle receiver. ... intended to function as a battle rifle by ...
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 ...
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 ...
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]
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)
The M27 Infantry Automatic Rifle (IAR) is a 5.56mm, select-fire assault rifle / squad automatic weapon developed from the HK416 by Heckler & Koch.It is used by the United States Marine Corps (USMC) and was originally intended for automatic riflemen, [6] but now is issued to all infantry riflemen as a replacement for the M4 carbine.