I recently received my M16 BCG from PSA and installed it on my Bushmaster 16" HBAR. Yesterday I got it out and shot it and ended up having all sorts of problems with it. I had also replaced the trigger with an ALG QMS (which functioned flawlessly), but had my original buffer installed. I had six magazines with me: 2 pre-ban 20-rnd mags with original allow followers, 2 pre-ban (1992) Center Industries magazines with new Wolff springs, and 2 new D&H industries teflon-coated aluminum magazines. I started out with 3 magazines with 5 rounds of IMI M855 each - two 20-rnd mags and a D&H magazine. The first 20-rnd mag went through just fine. When I put the second 20-rnd magazine in and released the bolt catch, the top round got hung up about half-way up the feed ramp. Once I got the round back into the magazine and used the charging handle to chamber the top round, the rest of the magazine went through just fine. I cycled through a few dozen rounds without any issues, and then things went quickly downhill from there. Several times, the bolt would gouge a deep groove in the brass when trying to strip it out of the magazine. When I say deep, I mean heavily dented (at least 1/32" deep and sometimes 1/16" deep). The dents ranged from a half inch to the entire length of the round before the bolt just stopped in place. After 100 rounds of IMI, I switched to PMC XTAC M193. I put 20 rounds in a 20-round magazine and the first round fired just fine, but then no matter how many times I pulled the charging handle back, it would not strip the top round out of the magazine. I dropped the magazine and tried to re-insert it, and it wouldn't even lock into the mag well. I made sure that the mag release wasn't stuck (it wasn't) and tried again, and the magazine (a 30-rnd with 19 rounds in it) just would not latch in place. I switched to a different 30-round magazine with 20 rounds of PMC Bronze in it and it wouldn't seat either. I was about to give up shooting for the day but decided to put my original Bushmaster BCG in place and give it a shot. It fired both magazines without any issues. I looked at the PSA BCG briefly but didn't see anything that looked wrong with it, but haven't had time to compare the bolt side-by-side with my Bushmaster bolt. Does anybody know what could be causing this? I managed to get about 100 rounds through the PSA BCG but it was very frustrating and constantly jamming (bolt embedding itself into the side of the brass and finally not being able to seat magazines at all), and then did 60 rounds with the original Bushmaster BCG without any malfunctions. Help? Thank you!