The Lahti L-39 is a Finnish 20 mm anti-tank rifle used during the Second World War. It had excellent accuracy, penetration and range, but its size made transportation difficult.
It was nicknamed “Norsupyssy” (“Elephant Gun”), and as tanks developed armour too thick for the Lahti to penetrate its uses switched to long range sniping, tank harassment and with the L-39/44 fully automatic variant, employment as an improvised anti-aircraft weapon. Aimo Lahti had doubts about the original idea of a 13 mm anti-tank machine gun and started working on a 20 mm design.
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