The P 39 had a 37mm Pontiac cannon that shot through the propeller.
The vast majority of the planes went to Russia during WWII.
The Russians were famous for reverse engineering many things. The B 29, the Rolls Royce engines uses in the Mig 15.
Now I do not know that they copied the 37mm in the P39.
But the Russians still use a 37mm cannon today and it is a very effective weapon.
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