I would like to find a nice J-frame revolver to go with my K,L, and N. The problem is that unless I have the revolver in my hands, how do I know it is a J-frame? Specifically, looking at the revolvers on online auction sites, unless the seller specifies the frame size (most don't), how do I know? Is there a good list showing what frame size specific models are? Or, more to the point, which models are J-frames?