With the stock retracted, the overall length of the weapon is 26.75 inches (679.4 mm). The overall length of the upper receiver is 19.25 inches (489 mm).
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 Quarter Battle Receiver ( CQBR) is a replacement upper receiver for the M4A1 Carbine, developed by the US Navy. The barrel length is 10.3 inches (260 mm).Ģ0- or 30-round detachable STANAG magazine The barrel length is 14.5 inches (370 mm).īottom: An M4A1 with a Close Quarter Battle Receiver. Top: An M4A1 with SOPMOD package, including Rail Interface System and Trijicon 4× ACOG.
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