Not my problems just post them here. Gonna try and see what can be improved or what kind of things can be SAFELY altered to make the mags operating as function. 1) My 30rnd detachable sometimes won't cycle the next round into the chamber, it slides down a little bit causing the bolt to slide over the next round instead of picking it up. a) Fixed this by pulling the magazine towards me while shooting. Never have anyother problems than that. I shoot a Yugo 59/66 accepts my magazine tight except for the lil sliding issue. Probably only falls 1/8 of an inch.