I bought a new M&P9 Pro Series. The front sight loosened up on the first range trip and moved around from shot to shot. I sent it back and they replaced to cheap fiber optic sights for the 3 dot sights per my request for free. Problem solved. It's the 2nd new M&P I've bought and just one of many Smiths. It's the only problem I've had so far. However, my friend did have a M&P 15-22 blow up on him last week. It didn't really blow up, but from how he describes it, there was a loud pop and the extractor blew out. I though that was strange, but I'm going to investigate that incident some more.