Close Quarters Battle Receiver
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).
| Specifications (CQBR) | |
|---|---|
| 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) |
| Cartridge | 5.56x45mm NATO |
| 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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