German Soldiers in Königsberg with a MG 151/20 Gun

Volkssturm men in Königsberg (East Prussia) with Panzerfaust and a MG 151/20 gun (Aircraft MG modified for ground use), winter of 1945. The Volkssturm used anything they could beg or borrow. Their supply situation was hopeless. Their only more or less standard weapon was the Panzerfaust. The MG 151 (MG 151/15) itself was a 15 mm autocannon produced by Waffenfabrik Mauser starting in 1940. It was in 1941 developed into the 20 mm MG 151/20 cannon which was widely used on many types of German Luftwaffe fighters, fighter bombers, night fighters, ground attack and even bombers as part of or as their main armament during World War II. The 20 mm MG 151/20 was also fitted on the Italian World War II fighter aircraft of the "Serie 5", the most effective Italian fighters of World War II. The one in the picture is a field adaptation of a Mauser MG 151/15 or 151/20, basically a 15 or 20 mm aircraft cannon fitted with a tripod and a makeshift shield

Source:
http://historyimages.blogspot.com/2011/10/1945-russians-were-coming-east-prussia.html
http://www.vintag.es/2013/04/color-photos-of-east-prussian-from-1944.html