Front & Rear Adjusting Ribs For Bull Barrel Revolvers
Slotted cam selects one of 3 pre-set positions for Rear Sight. Rear sight also has windage adjustment and an extra elevation screw to compensate for light or ammo changes.
Big Book Catalog, Issue:70, Page:294
SPECS: Blued steel. Approx. .7" (18mm) wide. Fits Ruger Speed Six and S&W “K” w/6" (15.2cm) long, .950" (24.1mm) - 1.062" (27mm) diameter bull barrels. 8¼ oz. (234 g).