Thanks for the info. What I have is two GM 58 caliber barrels mounted in Renegade stocks. I have the traditional sights you pointed out mounted on one of them. On the other one, I'm putting a scope (forgive me). And the scope mount I got required a Renegade sight to mount, which has two screw holes. The GM barrels I have have two screw holes (which match Renegade screw holes), but the GM rear sight on it only uses one screw hole. The adaptor for the scope uses both holes. Not being as young as I used to be, I can't use traditional rear sights that are back too far on the barrel beyond around 75 yards. So when I'll be hunting in an open field by my place (120 yards), I figured I'd use the scope on one of the GM 58s. I saw some inexpensive TC sights on an online sight, and only need the screw holes to line up with the scope adaptor and GM barrel. The TC sight mounts above the adaptor plate, and screws into the barrel (with longer screws), thereby holding the scope mount down. Thanks again.