The L7A2 General Purpose Machine Gun (GPMG) is a 7.62mm  belt-fed general purpose machine gun which can be used as a light weapon and here, when mounted on a tripod,  adopts the role of a medium machine gun in the sustained fire (SF) role with a range of 1,800 metres. In the SF role, mounted on a tripod the gun is fitted with an  optical sight,
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/69237022@N00">Brian Harrington Spier</a> from Shanghai, China
CC BY-SA 2.0
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/brianharringtonspier/8049542800/">Mukayras, Al Bayda, Yemen: 1966</a>