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).
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| - Close Quarters Battle Receiver
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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).
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| - stock extended
- stock retracted
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| - Close Quarter Battle Receiver
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| - Bottom: An M4A1 with a Close Quarter Battle Receiver. The barrel length is .
- Top: An M4A1 with SOPMOD package, including Rail Interface System and Trijicon 4x ACOG. The barrel length is .
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abstract
| - 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).
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