u/Cocker4268

So have been testing a rifle that was having issues cycling. 16in barrel carbine length gas tube. Had a 3.0oz buffer weight in it and wouldnt cycle. So bought a couple that were lighter. Installed the 2.6 and same issue so put a 2.2 oz and the gun started to cycle correctly ane about 15 rounds in the BCG locked up in the receiver. Finally got the BCG out and the round with the primer was gone. Also noticing some damage to the head of the casing. Opinions on what this could be. The ammo is also AAC 125gr