I was wondering if anyone else has had problems with the slides on their M&Ps rusting. I have a M&P .40 that I carry daily ccw in an inside the waist holster. In only two weeks after purchasing the pistol I noticed a large amout of rust starting to form at the front of the slide. I contacted S&W and they replaced the slide free of charge. I have now carried it for about a month since getting it back and it is already starting to rust again. I would be more suspecting of the holster if it wasnt for the fact that for an entire year previous to carrying my M&P I had an XD that I carried in the same exact holster without so much as one spec of rust forming. Can anyone give me some advice on what is reasonable for me to expect S&W to do in order to rectify the problem or any other advice on my situation. Thanks in advance.