If asked about the 7.62x39mm cartridge (aka the 7.62 Soviet and .30 Russian Short), the first firearm that comes to mind is almost certainly the Avtomat Kalashnikova, i.e., the AK-47 assault rifle.
“[T]he Russian military began to look for a ... a very impressive production tally in its own right. The SKS was my first-ever rifle purchase and indeed my first long gun purchase of any ...