Gen.4 G19. It has 04 RSA. No issues, but I only have about two hundred rounds through it. Just to be on the safe side, I stored it with the slide locked
back for a week before firing the first shot, and all but fifty rounds were 115 grainers(about half factory virgin load range ammo, and half +p and +p+ carry loads.) The odd fifty were 124+p. I personally LIKE the 115 grainers, but I also stuck with them for break-in because of all the negative press. I figured if it was gonna fail, I wanted to know up front. I would buy again, so long as it is
an updated RSA. My favorite Glock.