I have a one-week-old Glock (my first) that Im still trying to shoot the first 100 rounds through. At least one round out of every 10 to 15 will not fully chamber. The slide will attempt to close on this round and then lock up. In every case the slide has jammed so tight that it could not be manually closed or opened. Then it had to be taken to a bench and assisted. I saved each of the cartridges that created this problem and measured the dimensions. None of them were outside of the diameter or length parameters. These same rounds will chamber perfectly in my Browning Hi Power. I went by the dealer I bought it from and they said it was my ammo and refused to help. So I tried two other brands of new ammo with the same results (Winchester, PMC, and Federal, all 115 grain FMJ). I also tried three different magazines to eliminate that variable. My buddy at the range jokingly accused me of limp-wristing it and causing the problem so I handed him the pistol and it locked up with him on the fourth round. I have called Glock and to their credit they said send it back in, but didnt offer to pay the overnight shipping charges. Ive heard that Glock has the tightest chambers in the industry but are they all this tight? The chamber has been cleaned three or four different times already so I know its not dirty enough to create this hassle. Do people really carry around a pistol with a chamber this tight for self-defense? Like I said before this is my first Glock but not my first or fifth for that matter pistol. Help!