M-31 Suomi submachine gun

The Suomi (Finland) was one of the weapons designed by Aimo Lahti. Adopted by the Finnish army in 1931, was manufactured until 1944. Received widespread use in the Winter War, where its success would influence Soviet designs. Remained in use until the 1990s, several copies were bought by the armies of the world, including Brazilian police forces.

Specifications
Model: Suomi KP Model 1931 Incorporation: Tikkakoski Oy, and licensed in Denmark, Sweden and Switzerland Caliber: 9x19mm Luger / Parabellum Operation: Retreat direct, selective fire (semi-automatic or automatic) Weight: 4.67 kg Length: 87 cm Barrel length: 31.7 cm Rate of fire: 900 rounds per minute Charger: 20, 40, 50 or 71 cartridges Effective range 200m Initial velocity: 396 m / s