I recently discovered the 640 and was very excited to see this PC model come out. I'm a big fan of moon clips as well thanks to my Model 22-4's. I recently attended the NRA convention in Houston and of course Smith & Wesson had a huge booth w/ all their goodies on display. I handled one and was disappointed to find that it was locked up. I assume there was an internal mechanical issue but it seems like here's a gun on display, presumably it hasn't been fired much aside from initial testing, and it's already broken from being dry-fired? I'm sure you guy's guns are fine, but it shook my confidence in regards to my getting one. On the flip side I did handle a Jerry Miculek model and it has been added to the list I love .45 ACP!