The Finns developed the M-series (26, 31,
32, and 37-39) Suomi ,equivalent of Finland', submachinegun (SMG) after the
conclusion of World War I and developed this battlefield-tested, accurate and
reliable (although expensive) SMG into the mid-1940s.
The Suomi prototype was developed by Finland's Aimo Lahti in 1922. Four years later, the
Finnish designer rolled out the Model 31 (M/31), chambered for 7.65x22 Luger/Parabellum,
for the Finnish army. In 1931, Finland's army adopted the Lachti design, alternately
known as the Model 1931 or KP-31-Konepistooli ('automatic pistol'). The
M/31 was manufactured by Tikkakoski Oy of Finland and licensed to Madsen (Denmark),
Husqwarna (Sweden) and Hispano Suiza of Switzerland.
It should be noted that Denmark, Sweden and Switzerland produced variants of the
M-series-with varying barrel and stock lengths-for different applications.
The Suomi became a complement of the Finnish and Swedish armies and it was exported
to the Baltics, Europe and South America and saw action during World War II.
This SMG weighed a hefty 4.6 kilograms (10.14 pounds) empty, 7 kilograms (15.5
pounds) loaded (with a 71-round, drum filled with 9x19 mm Luger/Parabellum).
Most Suomi SMGs are 870 mm (34.25 inches) long with 314-mm (12.36-inch) barrels (the
M/37-39, produced under Swedish license, featured a short barrel; the M/32 SMG
was another exception, featuring no butt stock, only a pistol grip). It has an
impressive, 900-round-per-minute rate of fire and is effective to 200 meters
The Suomi-series SMG is a blowback operated, selective fire weapon that fired from
an open bolt. Magazine capacities varied (according to country of use and
application) to include 20-, 36- and 50- round box and 40- and 71-round drum
Production of the Suomi M-series ended with the conclusion of World War II, however, the
weapon was around into the 1990s when it was relegated to history's scrap pile
(or weapons collections), replaced with the advent of the modern assault rifle.