I figured I have a little bit of everything but being a mostly revolver guy I never considered the 9mm until recently. I just though it was a large hole in my tool box, so I found a good shooter grade Model 39 S&W to fill the gap. In 1955 S&W produced the first U.S. designed DA semi-automatic pistol for the US market. It's has an alloy frame, steel slide, DA/SA semi with single stack 8 round magazines. Now I need to learn how to load 9mm, so much for the no new caliber rule.