Unforgiven I am using PPU 165 grain,I am sure it is not the best but it is definitely not the worst either. It seems everyone is saying go real heavy with the oil and that is what I am going to do. Oh and yes,this is the first semi-automatic rifle I have ever owned.I have shot a M16-A1 and M16-A2 many times while I was in the Army but I never had to fix any problems with any rifle I used,they were pretty much just clean them properly and they shot perfect every time.