Wimmersperg Spz
The Wimmersperg Spz ("Sp" stands for STEN-pistole 'STEN pistol', "z" for zweiteilig 'made of two parts') was a family of German assault rifles that was in the planning stage during the latter days of Nazi Germany.[1] The overall weapon is largely made up from Sten Mk II submachine gun components (which the Germans copied as Gerät Potsdam), most notably the receiver and buttstock.[1] This function predates the similar operation used on the present day Steyr AUG series of rifles.This was reconstructed in full scale by a German designer on the basis of the original construction plans and then built by him.[3] He also designed the Wimmersperg Maschinengewehr in 1937, a double-barreled, combined gas/recoil operated firearm fed from either magazines or a belt feed with 7.92×57mm cartridges — which was unusual for that the top barrel acted as a gas piston.