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Designed by Aimo Lahti, the Suomi m/31 submachine gun is in my opinion one of the standout submachine guns of the World War Two era. Despite its hefty weight (10.4lb / 4.7kg) and lack of a good pistol grip stock, it still manages to be tremendously controllable and accurate, with a very high rate of fire (about 900 rpm).
For a detailed written description of the history and development of the weapon, I would refer you to the excellent article by Jaeger Platoon: http://www.jaegerplatoon.net/MACHINEPISTOLS1.htm
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