Anyone that was around back then and really knows why SS was added please chime in. Production I get, cheap to get in the sport grab a gun off the shelf and go. Open is open. Limited iron sight with all the xtras. Limited 10 just sucks. (I do feel bad for you people that don't live in America anymore). WO you can't afford an open gun and don't want to shoot minor. Revolver you like old stuff and holding up the line. Just kidding.