image cropped to show only bot carrier and bolt and gas piston
<ul><li><a href="//commons.wikimedia.org/wiki/File:AK-47_and_M16_DM-SN-82-07699.JPEG" title="File:AK-47 and M16 DM-SN-82-07699.JPEG">AK-47_and_M16_DM-SN-82-07699.JPEG</a>: UNKNOWN (not stated)</li>
<li>derivative work: <a href="//commons.wikimedia.org/w/index.php?title=User:DL24&amp;action=edit&amp;redlink=1" class="new" title="User:DL24 (page does not exist)">DL24</a> (<a href="//commons.wikimedia.org/wiki/User_talk:DL24" title="User talk:DL24"><span class="signature-talk">talk</span></a>)</li></ul>
<ul><li><a href="//commons.wikimedia.org/wiki/File:AK-47_and_M16_DM-SN-82-07699.JPEG" title="File:AK-47 and M16 DM-SN-82-07699.JPEG">AK-47_and_M16_DM-SN-82-07699.JPEG</a></li></ul>