Pict:

If in your travels in Brazil you happen to be in the neighborhood of the Taurus firearms factory, stop in and ask them to consider building a 5-shot, three inch barrel, stainless steel, double action, adjustible sights, 357/9MM.

Instead of just a spare cylinder for the 9MM, tell them to make it a complete crane assembly attached to the cylinder so that conversion from one caliber to another would be quick and simple.

Right now, the only manufacturer of that combination is Strum Ruger Firearms and the one they have is a single action.

Bountyhunter