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The Close Quarter Battle Receiver (CQBR) is a replacement upper receiver for the M4A1 Carbine. 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.
Its preliminary National Stock Number was 1005-LL-L99-5996; however, a complete CQBR-equipped carbine now has the NSN 1005-01-527-2288. The overall length of the upper receiver is 19.25 inches (489 mm). With the stock retracted, the overall length of the weapon is 26.75 inches (679.4 mm).
|Weight||2.72 kg (6.00 lb)|
|Length||762 mm (30.0 in) stock extended
679.4 mm (26.75 in) stock retracted
|Barrel length||262 mm (10.3 in)|
|Action||Gas-operated, rotating bolt|
|Muzzle velocity||900 m/s (2,953 ft/s)|
|Effective range||500 m (547 yd)|
|Feed system||20 or 30-round STANAG detachable box magazine|
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