The Probert Encyclopaedia of Warfare

SUOMI M1931

The Suomi M1931 was a Finnish blowback operated selective fire sub-machine-gun developed in 1931 and produced until 1944. The Suomi M1931 was very heavy, expensive to manufacture but very solid. It took a 9 mm Parabellum cartridge from a variety of magazines, usually a 50-round box magazine or a 71-round drum magazine. It had a cyclic rate of 900 rounds-per-minute and a muzzle velocity of 399 meters-per-second. The Suomi M1931 saw action with Scandinavian armies, the Swiss Army, in Poland and South America.
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