Not sure what this guy was doing, likely AFK for whatever reason (even minimized he had time to maximize and react). Anyway, I knew the gun had 7.62x39 US (checked mag when I picked it up off of another PMC I killed earlier) but didn't think it was THAT bad. Turns out it does literally nothing to armor. Full mag and the helmet wasn't even 0'd - had 10+hp left!!! Yet, 1 shot from the same caliber but PS and he was dead instantly. I honestly thought he was DC'd and had god-mode until I remembered about the round type I had....