Ultimate Arms Gear Machined Aluminum Deluxe AR15 AR-15 M4 M16 Rifle Set Of 2 7/8" Accessory Mount System Made From Black Coated Aircraft Grade Aluminum - Designed And Tested For Use By Military And Law Enforcement. Fits Directly On Your Forend - Great For Attaching Weaver/Picatinny (7/8") Based Bipods, Lights, Laser, Sights, Scopes, Swivels ETC. Can Also Be Used As A Scope Mount With Shotguns And Rifles That Can Have s Screwed In (wood-polymer) Or Tapped (metal). Each is 5" Long With Swivel Housing And 12 Separate Slots - 2 are Included Complete With Hardware & Screws Easy Installation