I "get" the entire logic behind a 9mm revolver. The shorter case loaded to higher pressure is far more efficient than any .38spl case, and the rimless design is superior when used with moon clips. Also, the use of moon clips is about MORE than simply being able to load faster - moon clips contain the shells "en bloc" which means the entire unit comes back out, as opposed to ejecting "loose" shells where some may hang up, or work (with longer barreled guns) the ejector star moves out far enough to allow a rim to jump behind the star IF the operator has not been scrupulous in using proper ejection technique. But what I don't "get" is why S&W (or anyone else) doesn't make a DEDICATED frame and cylinder specific to the 9mm! IF they were marketing "convertables" with a spare .38spl cylinder and running a .357" bore I could see the "standard" frame length, but they're not. So why not take the J-frame in another notch by creating a "short frame" version with the frame and cylinder length sized specific to the 9mm. This would also apply to a .40S&W version as well. I think as long as rimless chamberings are nothing more "exotic" than a caliber change, rimless revolvers (other than the .45ACP) will forever reside in the "niche market" realm, but if someone starts with a clean sheet of paper and designs a J-frame "pattern" around and dimensioned too the 9x19, consumer interest would flare.