Precision machined, true Mil-Spec Picatinny Rail for mounting a scope, red dot, or laser on your Ruger MK Pistol. Fits Ruger Mk, III, and 22/45 factory pattern screw holes. Screws included. Anodized flat black for no glare. Compatible with Weaver or Picatinny style rings. Rear is gracefully machined to blend with the factory adjustable rear sight (see photo).