In the fall of 1944, the Mauser company was given a contract to develop drawings of a direct copy of the British Sten gun (code named Gerät Potsdam), and to manufacture 10,000 of them. In fact, they were to make two different sets of drawings; one suitable for large factory use (like their own) and one for use with distributed small shops making parts for final assembly elsewhere (which is how much of British Sten production was done). The contract was fulfilled and 9972 guns in total were produced and accepted by the German military in November and December of 1944.
Why would Germany was a copy of the Sten? Well, they actually had a decent number of them. The Allies were air-dropping Stens all over Europe, and a lot of those drops were captured by German troops, not the resistance fighters they were intended for. By the end of the war the Germans were in desperate need of arms, and the Sten was both simple and already in some German use with the Volkssturm…so it actually was not a totally unreasonable idea to produce more of them.
Today, the Potsdam is an extremely rare gun to find. The two visible identifying features are the magazine well and barrel shroud, which are both made with a folded and spot welded seam. The barrels are also identifiable as they have 6 groove rifling, which the British did not use in the Sten.
Before the Potsdam production was finished, Mauser began working on further plans to simplify the design. That would be the Gerät Neumunster, aka the MP 3008. For that part of the story, see my video on the MP 3008:
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