Suomi M-31 SMG
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| Suomi KP/-31 | |
|---|---|
 Suomi KP/-31 |
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| Type | Service submachine gun |
| Place of origin | Finland |
| Service history | |
| In service | 1931–1982 |
| Used by | Finland, Sweden, Denmark and Switzerland among others |
| Wars | the Winter War and WWII (or the Continuation War) |
| Production history | |
| Designer | Aimo Lahti |
| Designed | first prototype in 1920 or 1921 |
| Produced | 1931–1944 |
| Number built | ~80000 |
| Variants | Kpist m/37 (Swedish cal. 9 x 20 mm SR Browning Long) Kpist m/37-39 (Swedish with shortened barrel, cal. 9 x 19 mm Parabellum) Kpist m/37-39F (Finnish model, cal. 9 x 19 mm Parabellum) Madsen-Suomi (Danish model, cal. 9 x 19 mm Parabellum) Hispano Suiza MP43/44 (Swiss model, cal. 9 x 19 mm Parabellum) among others |
| Specifications | |
| Weight | 4.6 kg |
| Length | 870 mm |
| Barrel length | 314 |
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| Cartridge | 9 mm Parabellum or 7.65 mm Browning |
| Action | blowback |
| Rate of fire | 800 - +900 round/min |
| Muzzle velocity | 396 m/s |
| Effective range | ~200 m |
| Feed system | 20, 36, 40, 50 or 70 round |
The Suomi-konepistooli KP/-31 (Finland-submachine gun KP/-31) was a submachine gun of Finnish manufacture that was in service during World War II. It was a descendant of the M/-22 prototype and the KP/-26 production model, which was revealed to the public in 1925. The Suomi-konepistooli KP/-31 is often abbreviated to just Suomi KP/-31.
The Suomi KP/-31 is regarded by many as one of the best submachine guns of World War II and it was so successful that some features from the Suomi KP/-31 were copied in the design of the Soviet PPSh-41 submachine gun, such as the magazine. The accuracy compared to the mass-produced PPSh-41 is superior, thanks in part to a noticably longer barrel, with the same rate of fire and an equally large 71 round drum magazine. If anything, it also possesses superior durability over the similar Russian SMG.
The M/-22 and KP/-26 were made by Konepistooli Oy (the name is Finnish for submachine gun), founded by Master Armorer Aimo Johannes Lahti, Captain V. Korpela, Lieutenant Y. Koskinen and Lieutenant L. Boyer-Spoof. The Suomi-submachine gun KP/-31 was designed by the duo of Lieutenant Koskinen and Master Armorer Aimo Lahti.
The Suomi KP/-31 went into serial production in 1931 by "Tikkakoski Oy" and most of these weapons were bought by the Finnish Defence Forces. The Finnish Defence Forces were equipped with about four thousand Suomi KP/-31 submachine guns when the Winter War started.
Suomi was also manufactured under license in Sweden, Denmark, and Switzerland. Tank and pillbox variants were also developed and produced in Finland.
[edit] See also
[edit] External links
| Finnish infantry weapons of World War II |
|---|
| Side arms |
| Lahti L-35 |
| Rifles & carbines |
| M/27 Pystykorva | M/39 Ukko-Pekka |
| Submachine guns |
| Suomi M-31 SMG |
| Machine guns & other larger weapons |
| Maxim M/32-33 | Lahti-Saloranta M/26 LMG | L-39 20 mm Lahti |
