I disagree with the poster who said it’s not high powered. The 7.62 round is a big round. But it definitely isn’t an assault rifle. Did the one he used have a hi-cap mag?
In the firearms community, 7.62x39 is considered an intermediate cartridge of a little more than half the ft-lbs (~1800) of a high-powered cartridge, and about twice the ft-lbs of a .45 pistol round. Physically, it's significantly smaller in length than the Russian high-powered round 7.62x54R, which if I remember correctly hits with about 2900 ft-lbs, on par with an American 30.06 or .308.
Still makes people just as dead though.
Excellent! You get a gold star! :)