I just bought a 3904 off Gunbroker. I already have a 3913 I use for Summer carry under a shirt but I wanted 1 more round, a little longer grip and a little longer sight radius. I figure I can conceal another 1/2 inch of butt. We will see. The slimness of the 3904 reminds me very much of my old 45.

I have owned a 5906 for 20 years and it took getting my carry permit for me to appreciate the single column 9mm Smiths. I cannot believe S&W let the 3913 go out of production. I wish someone would buy the rights from them and put it back into production. Sig does well with their 239 and I think the 3913 is a better, slightly smaller pistol.