This guy nails it the striker is in the slide and the sear is in the frame and the 320's just have too much play in their slides and frames. In all my years of firearms I've never seen a gun with this much slop in it. Add a security holster that depresses the trigger slightly and then have the gun bumped in the wrong place and you get Bang. A few years ago I heard that Sig hired a executive from Kimber that had pumped their numbers up at the expense of quality. It appears he has done the same at SIG. Also I believe the Army has not had the problems because they still require their MP's to carry with an empty chamber. The Air Force treats their Security Police more like civilian cops.