I sent my C9 back to mom 2 weeks ago. It had a gash in the slide surface about where the sear is, how it got it or what caused it I don't know. I called mom and the they said to send it and all magazine used in. I got it back yesterday with a list of all things done to it, new firing pin and springs reamed chamber, buffed slide, new clips and springs. They also sent back 2 new 10rd mags and 1 new 8rd mag to replace the old ones, they also sent me an extra 8 rd mag for my troubles. Oh and a trigger lock which mine never came with. I have to say, I don't know why they did all they did to my c9 but it is the smoothest C9 I have felt. Gotta love CS like that!