I would call the AK the real first all around assault weapon. 7.62x39 (.30cal) short to intermediate range effectiveness, concealable with a folder.
The STG was also never built in massive quantity either.
Good debate, but I never liked the term "assault rifle" either. Especially since the media has hijacked the word.
Nazi Scientists assisted the US rocket programs from the 50s to the 80s...and its Reagans fault.