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The Maschinenkarabiner 42(W) or MKb 42(W) (Machine carbine model of 1942 (Walther)) is an early German assault rifle designed in 1940 – 1941 by Walther during World War II. The Mkb 42(W), and the more successful Maschinenkarabiner 42(H) (MKb 42(H)) designed by Haenel, were predecessors of the Sturmgewehr 44 (StG 44) assault rifle.