![cover image](https://wikiwandv2-19431.kxcdn.com/_next/image?url=https://upload.wikimedia.org/wikipedia/commons/thumb/7/7f/M4A1-CQBR.png/640px-M4A1-CQBR.png&w=640&q=50)
Close Quarters Battle Receiver
US assault rifle / From Wikipedia, the free encyclopedia
The Close Quarter Battle Receiver (CQBR) is an alternative upper receiver for the M4A1 Carbine. It was developed by the US Navy.
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![](http://upload.wikimedia.org/wikipedia/commons/thumb/7/7f/M4A1-CQBR.png/320px-M4A1-CQBR.png)
A M4 upper receiver with a shortened barrel of 10.5” inches in length and has two variants, the Mod 0 and Mod 1.