I have a Wondersight for sale that fits Smith & Wesson and Colt revolvers. It is the sight that fits in the top side plate screw hole and turns your fixed sighted revolver into an adjustable sighted revolver. I sold the gun that had these sights were installed on. First "Ill take it", of course gets it. I think they are around $40 new. My price $20 shipped. Comes with tool and instruction sheet.