Tags: Weapon.
The Close Quarter Battle Receiver (CQBR) is a replacement upper receiver for the M4A1 Carbine developed by the US Navy. The CQBR replaces the M4 with a barrel 10.3 in (262 mm) length making it the modern equivalent of the Colt Commando short-barrel M16 variants of the past. This shorter barrel makes the weapon significantly more compact which makes it easier to use in and around vehicles and in tight confined spaces.
