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The Finnish Kp/31, is by all means a very first generation subgun, a lot like the American Thompson; it's heavy, expensive to make, uses a heavy and expensive drum, and has a lot of bulk.
That said, like the Thompson, the Kp/31 was a pretty good performer once you had one in your hands, being heavier than a battle rifle is a drawback in terms of having to carry the fucking thing, but given that it's in 9mm Luger, it's *extremely* easy to control this little monster as it spews out bullets at +900rpm (it's an amazingly easy gun to keep on target), and the 72rd drum magazine, while expensive and heavy also, it's an excellent magazine, probably one of the most robust and reliable drums of the 20th century.
The Kp/31 was famously used by ski troopers in hit and run tactics against Communist invaders; a squad of angry Finns come zipping out of the treeline on the right, blasting a swarm of .36 caliber FMJ on a platoon of Russian conscripts, and then disappears in the left treeline before the survivors can get to their feet and get a bearing on what just happened.
White Death famously used a Kp/31 to kill 200+ Communists over his tour in the field.