Quiz of the Day - 16 November 2012

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A WWII era underground production gun forms today's question.

The gun's designer was a blacksmith and self-taught amateur gunsmith from Poland. During the German occupation of Poland he became a gunsmith of the local Bataliony Chłopskie underground Polish resistance organization. In spring of 1943 he completed a working prototype of his own submachine gun. Today, only a single example of the sub-machine gun or machine pistol exists.

Identify the gun. 

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Cheers!