Thanks for your answer. First of all, this is not my first automag, I'm play paintball for long time. I know how automag works, and when I contacted you was with the intent of informed before I try to fix my self. So I open and relube, and Still leaking. I order new o-ring kit, maybe is the spacer o-ring or a bigger spacer will be necessary (the one in the marker know is .220, maybe need one .225, by the way do you have one in this size?).