A M4A1 with a Close Quarter Battle Receiver. The barrel length is 10.3 inches.
<a href="https://www.wikidata.org/wiki/Q11220" class="extiw" title="d:Q11220"><span title="maritime service branch of the United States Armed Forces">United States Navy <small>(Q11220)</small></span></a>
2022-05-23
This file was derived from: <a href="//commons.wikimedia.org/wiki/File:CQBR-alone.jpg" title="File:CQBR-alone.jpg">CQBR-alone.jpg</a><br>