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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.
On December 8, 2010, Adcor announced production of the A-556 rifle to the civilian market. On June 27, 2011, it was announced that the improved A-556 Elite variant would be available for sale to the public. In June 2012, a soldier was seen in Afghanistan with a A-556 upper receiver with a 10.5 inch barrel on an M4 lower receiver. [4]
The flattop upper receiver with the Picatinny rail was introduced with the M4A1 variant in 1994, and all subsequent orders for all M4 variants would have a flattop upper receiver. Variants of the carbine built by different manufacturers are also in service with many other foreign special forces units, such as the Australian Special Air Service ...
ArmaLite AR-15 with the charging handle located on top of the upper receiver, protected within the carrying handle and a 25-round magazine. 1973 Colt AR-15 SP1 rifle with "slab side" lower receiver (lacking raised boss around magazine release button) and original Colt 20-round magazine.
The Armed Forces of the Philippines later increased the order to 63,286 R4s which are designated as the R4A3 which is equivalent to the Colt M4 R0977 model and replaces early model M16s. [10] [11] [12] In March 2015, Remington announced that it would offer the R4 to the civilian market. [13]
Though originally called the M16A2 Commando, Colt now markets them as the M4 Commando. [ 14 ] The M4 Commando with its short 11.5-inch (290 mm) barrel suffers the same failings as its predecessors: a substantially lower muzzle velocity and greater muzzle flash, in comparison to longer M16 rifles and carbines.
The M4 Type Carbine is a copy of the Colt M4 carbine. The semi-automatic version is marketed to the U.S. civilian market in compliance with the National Firearms Act. A select fire variant can be ordered by military or law enforcement organizations with three-round burst or fully automatic capability. [5]
In 1995, Colt would introduce the Model 933 as the M16A2 Commando, after the success of the M4 Carbine. These modernized Commandos have a "flattop" receiver, with a removable carry handle and a MIL-STD-1913 Picatinny rail, and semi-and-fully automatic fire capability. The parts are also interchangeable with the longer M4 Carbine.