I sent my new M&P340 back to S&W for a really weird and potentially dangerous issue (see: http://www.northeastshooters.com/vb...ith-my-new-M-amp-P-340-***UPDATED-(page-3)*** ) They called me yesterday and the CS rep told me they needed an FFL to ship it to because they replaced the frame and cylinder and now it has a new serial number. I asked if they knew what caused it or if they just replaced the damaged parts. He said he didn't know. What if the issue was the barrel? I really would like to talk to the person that looked at it before I accept it back but they aren't really giving me that option. Based on anyone's experience and the problem I described in my original post, what is the likelihood that my problem was in the barrel and not the frame/cylinder? How would you proceed?