I am confused as well. Sometimes (rarely) they cycle fine and consecutive rounds will fire. Sometimes they go into battery fine, but I get a light primer strike. Sometimes they seem to just get hung up going into battery. The slide is held back by the round, and the bullet does not clear the feed ramp into the chamber. Can not figure out any pattern, rhyme or reason. All pass the plunk test. Both weapons are new, and so is the brass. Bought as Win USA, and have been reloaded one to three times. I use a tumbler and one shot case lube. Bullets lubed with liquid Alox, and sent through a sizing die. Maybe polish feed ramps on both the GLOCK and AR-9?