For use on Ruger Mark III Pistol. AimPoint Mounts for Mark-III replace the standard mount for Micro sights. This Micro sight Mount by AimPoint is very simple to install and use. The mounting screws fit directly into the factory-drilled and tapped accessory holes on the top of Ruger Mark III Firearm. AimPoint Mounts transform your Ruger Mark III Pistol into a fast shooting and hunting weapon.