Yeah I had a gun smith polish the chamber on mine and it seemed to help quite a bit. Had a jam or two after that but they were no where near as often and understandable as most things will jam or hang up every once in a while. However, I was still never really thought that much of the gun after all those problems I had previously had. I'm not convinced the chamber fixed it fully but it did seem to help some. I just think in the future I can buy a nicer gun for the same price or not much more. The quality just didn't seem to be there to me and the problems I had left me just not liking it that much.