37mm anti-aircraft automatic cannon model 1939 also known as the 61-K at Bagram Air Base in Afghanistan.
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/33896385@N03">Jonathan Mallard</a>
CC BY 2.0
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/33896385@N03/3485249040/">Playing on the old gun</a>