As the title states. I have purchased 10 Bushmaster 30 round mags and all fail to feed after 3 to 5 rounds. I am loading them with 20 and tried with 30 rounds with the same results. Purchased 2 five round magazines for hunting and they do not skip a beat. Wrote Bushmaster and recieved no reply. Follower, spring, retention lips????? WTH?