The Yankee Hill Triple Mount is a fantastic way to add rail sections to your AR-15. This innovative product mounts directly to barrels with diameters of .73" and .75" and comes with the required bushings. This now gives you three rails sections to mount your lights, lasers, or other accessories quickly and securely. This is made of high quality and hard anodized to mil spec standards. Excellent for barrels with or without bayonet lugs. NO GUNSMITHING REQUIRED.