The below is copy and pasted straight from the
Dan Wesson website. It's in the FAQ's. Hope it help's, Cal
INTERCHANGEABILITY
Cylinder/caliber interchange?
We don't sell cylinders, crane assemblies or extractor assemblies and only allow replacement of these components and assemblies to be performed at our factory service department.
The reason for this is that each double action cylinder is different and a number of parts and assemblies have to be fitted specifically to each individual cylinder and frame to ensure that the chamber in battery position ranges with the barrel. For this same reason cylinders cannot be interchanged on a double action revolver allowing caliber changes. Beyond that, we thread the frame end of barrels of each caliber differently to prevent putting a barrel of one caliber on a frame with a cylinder of a different, especially a larger, caliber--basically, we want to keep our owners and shooters around!
We also do not change the cartridge capability of our revolvers, as this would negate the accuracy of BATF records regarding your revolver, and we certainly wouldn't want to upset the folks at BATF, now, would we?