It’s tough being the little guy on the block, especially when the guy picking on you looks like Drago from Rocky IV. Finland experienced a similar scenario in 1939 when the Soviet Union—partnering up with our favorite bad guys, the Nazis—faked an attack on one of their own villages to give them an excuse to invade their smaller neighbor to the west. The Soviets came at the Finns with an army of 19 divisions; the Finns could field only nine. But Finland also had something the Soviets didn’t: the Suomi KP/-31.

Where you’ve seen it:
Go figure, most films showcasing this chunky submachine gun are Finnish in origin, and pretty obscure as a result. The film The Winter War (right), shows the Suomi in use several times, if you’re willing to read some subtitles.
History:
The Finns didn’t have the odds in their favor. They were forced to defend an 800-mile border against three times the infantry, 30 times the aircraft, and 100 times the armor of their forces. Fortunately, they had a few things going for them the Russians didn’t. First, Stalin’s Great Purge of 1937 had eliminated over 30,000 officers from the Red Army, leaving his forces with inexperienced and inefficient leadership. This didn’t help the Soviet troops feel particularly enthusiastic about fighting, either. Second, the Russian forces had no submachine gun in their arsenal. Mainline troops were equipped with the Mosin Nagant rifle, and for those who might own one or two, you know just how handy they’d be in close-quarters fighting: You’d be better served using them as a club. In contrast, the Finns had the automatic Suomi KP/-31, designed by Aimo Lahti in 1925, issued two to each squad. This proved to be an overwhelming advantage in firepower, the Suomi capable of dumping 9mm Luger rounds from a 71-round drum magazine. Though Finland eventually lost the war (it was hard to beat the Russian numbers), they blackened the eye of the mighty Russian army and left a lasting impression on the Soviets. So much so, in fact, the Red Army followed the design of the Suomi to develop their own close-quarters “burp” gun that saw extensive use in WWII—the PPSh-41.
The design:
The Suomi functioned on a straight blowback action, firing 900 rounds per minute. Parts were milled, making the Suomi of higher quality and higher cost than its stamped-steel protégé, the PPSh-41. A muzzle brake was added midway through the Winter War to help with the Suomi’s muzzle rise, but Lahti thought it made the gun less reliable and reduced muzzle velocity (the latter is patently false). So troubled that the army would adopt this addition to his design, Lahti attempted to have its designer court-martialed.
The cartridge:
The Suomi was chambered to the venerated 9mm Parabellum, which was loaded into a 20-, 36-, or 50-round box magazine, or a 40- or 71-round drum. The drums tended to be less reliable, but if a soldier could find one that behaved well with his gun, he held on to it.
The verdict:
Seventy-one rounds of 9mm in an automatic SMG is impressive even by today’s standards: Imagine what kind of advantage it would present back in 1925! In shooting the semi-automatic variant (shown top), a couple things become apparent: One, it’s heavy: Around 15 pounds loaded. This proves to be advantageous during rapid firing, as recoil is completely soaked up (recoil of the Suomi is on par with a .22, in my opinion), and muzzle rise is very limited. This is intentional—meant to make the automatic a little more controllable back in the day. And two: This might just be the most fun 60 seconds of shooting you’ll spend wasting a box and a half of shells.
Great article! Glad to see the Finnish weapons getting some attention; their Mosins and AK builds are also of very high quality. I was under the impression though that the Finns didn’t really lose the war; if I remember correctly they ended the initial 1939-40 war with a favorable truce but ended the Continuation War with a truce that favored the Soviets.
Great article! Glad to see the Finnish weapons getting some attention; their Mosins and AK builds are also of very high quality. I was under the impression though that the Finns didn’t really lose the war; if I remember correctly they ended the initial 1939-40 war with a favorable truce but ended the Continuation War with a truce that favored the Soviets.
Spudgunartillery Well, in Winter war casualties were heavy (26 662 dead) and some land area was lost. However, we remained independent and country was not occupied. Soviet casualties can only be estimated, but 200 000 to 300 000 is believed to be close to truth. Nikita Crutchev said 1 million but it’s most likely over estimated.
When they absolutely, positively, got to kill every mother fucker in the room…. lol
The moisin Nagant is a great CQB melee. You can stab or skewer three or ore enemies together with it’s bayonet, and brake a lot of melon with it’s nice iron butt.