I doubt it is a gun issue, do you have the steel base plate or the softer ones? I would look to see if the base plate is a bit different on the bad one. If you an't make it work I would go back to the LGS you bought it from and tell them it doesn't work. They may be able to fix it or replace it or get CZ to get you a new one. I am pretty sure it will be an easy issue to resolve.