No gunsmithing semi-auto pistol mounts integrate with the pistol’s original components to assure optimum performance with every trigger pull, superior to any grip" mounted system. The 1911 goverment frame pistol mounts are see-thru design and provide minimum slide clearance for a sleek look. The pistol mounts provide full-length ring rails for maximum eye relief adjustment. Colt .45 1911 Government Frames and all other clones: Uses slide stop pin to attach. See-under type mount allows use of gun’s sights. Elevation adjustment. Standard Dovetail Base for any Weaver-type rings.