StG-44.......grandfather or modern assault rifle especially the famous Kalashnikov!!!! XD
It was actually an abomination. Neither SMG or rifle, while certainly not an assault rifle (no such thing as of that time). And just to say, it's not the first automatic rifle.
At the same time, while STG44 and AK has uncanny appearance, their internal designs are different. So AK certainly is not based on STG44.