Hey guys - first post here, and I'm hoping someone can help me with an M&P Shield 9mm problem. I was at the range today, and the last round of a magazine failed to fire. I don't think it was a misfire; if I remember right the trigger was just mush when I tried to fire that last round. While still at the range I tried several times to fire it with no success. The problem now is, I cannot rack the slide back from its closed position. I've tried it with and without a magazine, with and without rounds in the magazine, with the safety on and off, every combination I can think of. The slide isn't just stuck; it is absolutely locked in the closed position. When I try to rack it, it has about 1/8" of play with a noticeable "click" in both directions. Trying to force the slide back doesn't work; it is firmly locked in place with a live round in the chamber. If anyone has an idea what the problem might be, I would be most appreciative. Thanks in advance for your help...