Ok so here's the story... Before I put an XD on layaway I went down to the local indoor range and rented an XD and an XDm. I was already pretty set on the XD as I didn't feel the XDm offered enough to justify the extra $150 the local store was asking for (just my opinion) but I wanted to give the XDm a go. I put a box of 50 through the XD with no problems. Loaded up the XDm next. Fired one shot, then my second shot, went to fire my third and....nothing. Cleared the mag and the bullet in the chamber. Put the magazine back in, pulled back on the slide and I was able to get another two shots off before the same thing happened. I assume this has something to do with just being a really abused rental gun but just out of curiosity more then anything I'm wondering if someone could figure out what went wrong.