Sergei Gavrilovich Simonov was a Soviet firearms designer known for the SKS carbine and the PTRS-41 anti-tank rifle. Simonov is considered one of the fathers of the modern assault rifle.
Simonov during a test of the PTRS-41 anti-tank rifle, firing 14.5×115mm rounds that he himself designed in 1941.
7.62×39mm
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The 7.62×39 mm round is a rimless bottlenecked intermediate cartridge of Soviet origin. The cartridge is widely used due to the global proliferation of the AK-47 rifle and related Kalashnikov-pattern
A steel-cased 7.62×39 mm FMJ cartridge
Steel-cased 7.62×39mm FMJ cartridge
From left to right: 7.62×54mmR, 7.62×39 mm and 7.62×25mm Tokarev
7.62×39 mm bullet wound on an American soldier from the Vietnam War