B-Square's Colt .45 Auto scope mount fits on the frame of the gun, not the grip. It has elevation adjustment necessary to zero scopes on the .45s. The mount attaches by replacing the gun"s slide stop. A famous Pachmayr design extended lever slide stop is furnished with each mount. The mount is easy on and off, and all gun accessories can be used with the mount installed. It has a standard dovetail base for any Weaver-type rings (not included), Aimpoint, Tascorama, etc., and the sights can be used with the scope installed.