While cool this rifle wasn’t made during ww2 it was just only a concept then so technically speaking the gun wouldnt have existed back in WW2 but Alex from Wimmersperg – Die Bastelkammer – der Tüftler-Blog produced a non-firing copy of Wimmersperg Spz-l using the blueprints and the images are from that model, SPZ-KR would have had shorter barrel and would have fired in burst infact beside SPZ-1 all of the 2 models would fire in burst mode