I have a 9mm Smith M&P and the magazine was no longer in it when I took it out from my belt. I'm guessing it fell out somewhere and I may not have heard it! I am wondering if anyone ever had or heard of a mag just falling out of an M&P. Not even shooting, just holstered and going about daily business. It still had one chambered, and I wouldn't take the magazine out and carry one round. The serial starts with MPV if that makes a difference. All around, a very odd situation.