I recently had the opportunity to put a Big Dot on a S&W J-Frame. Same sight as the Ruger SP101, and same process for installation. Your gun is a candidate if it is a newer J-Frame with the pinned front sight, otherwise the gun would have to milled to accept it, and blued refinished. Probably not feasible if you don’t have the pinned sight. At 25 yards it was no trouble for me to hit pie plates at our local range. The sight sits...