I have had no issues with firing, slide jamming up or anything like that. 500rnds and no problem. But what I discovered is when I slam a loaded mag in it with the slide back, it automatically chambers (not fires) a new round. (Slam doesn't seem to be a good word...more like intensely insert). I can't find anyone who has this issue, if it's even an issue. It doesn't do this when I just put one in. Any one have input on this subject?