I've got a Russian SKS
Put it in a poly stock and droped the fixed max for high cap detachables the day i bought it 14 years ago.
The only FTF's I've had is with 1 extended 40 rnd mag. The steel 20rnd & 30 rnd mags feed flawlessly.
Oh yeah, and i paid $75.00 for it. Army buddy was getting a divorce and needed the cash, but again, that was 14 years ago.