You call them Smolts, I call them Smythons. Both my 3" and 6" python barrels are on S&W model 19-5s. Whoever did the conversions on my guns slicked up the actions to the point that they are better than my stock Pythons and almost as good as my Colt Custom Shop Python. I also have a Couger (Python barrel on a Ruger Security Six). The Couger does not have as smooth of an action as the Smythons (Smolts), however, the grip and frame size of the Security Six fits my hand the better than the Smiths or the Colts.

Mark