The Suomi m/31, designed by Aimo Lahti, is a highly reliable Finnish submachine gun known for its exceptional machining and accuracy. Despite its heavy weight and high 900 RPM rate of fire, its design features like a non-reciprocating charging handle and a pneumatic venting system contribute to its controllability. It saw extensive use in WWII and remained in service for decades, with various magazine types and a later muzzle brake variant.
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