I have just over 10,000 rounds fired through my 3rd generation G19. Use to fire anything I fed it including LAWMAN 124g ammo. Received a new case of LAWMAN 124grain ammo (a few months ago) and have been receiving a fail to fail/fail to eject almost once per magazine. Fires the 115g ammo just fine. Not a magazine issue but with the ammo being "new" to me wondering if I should be suspecting the new case of ammo or the old return spring or maybe something else? Pistol does get cleaned after nearly every trip to the range so it is not likely to be issue with carbon build up.