Close Quarters Battle Receiver
US assault rifle From Wikipedia, the free encyclopedia
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The Close Quarter Battle Receiver (CQBR) is an alternative upper receiver for the M4A1 Carbine. It was developed by the US Navy.
 | This article does not have any sources. (October 2023) |
A M4 upper receiver with a shortened barrel of 10.5” inches in length and has two variants, the Mod 0 and Mod 1.
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