Marble's Front Sights have been the gunsmith's standard since 1900. These sights are windage drift adjustable and fit a standard 3/8" dovetail. A gold or white bead aiming point are offered. Some sights may also incorporate a fiber optic tube that absorbs ambient light, creating a brightly lit aiming reference point. Gunsmithing required. Steel. Blue. Note: Height is measured from top of bead to the bottom of the dovetail.