Unless its just for fun or to say you have one. The AR platform does NOT like the taper in the 7.62x39 round. I would put it at 60-70% reliable.. Feed issues constantly, some mags are better then others but with all the searching I have done NOBODY has or knows of a 7.62x39 AR mag they would trust their LIFE with. Some had had good luck with select mags or by grinding/polishing mags but still at about 80-90% NOT a happy camper !!!!!