Brownells 30mm Cantilever Scope Mount he Brownells AR-15 Cantilever Scope Mount is a true one-piece scope mounting solution for your AR-type "Modern Sporting Rifle." It positions the scope forward to give you plenty of eye relief, while it elevates the scope high enough for a comfortable head position and plenty of clearance for the objective bell. Machined from a solid billet of 6061 T6 aluminum, our AR-15 Cantilever Scope Mount is lightweight, strong, and rigid. A pair of hardened steel 1/2" hex nuts provide tremendous locking force to ensure your mount - and the scope attached to it - stays in place. Remove the mount/scope unit from the rifle and reinstall it with little-to-no shift in the scope’s zero. Positions centerline of optic 1.4" above receiver - ideal for comfortable head position Fits scopes with 30mm tubes Attaches to standard Picatinny receiver rail slots Weighs only 7.5 oz. Proudly Made in the U.S.A. A Brownells AR-15 Cantilever Scope Mount gives any 30mm scope you choose to mount on your rifle a solid, stable, secure platform that helps you enjoy the best performance from both rifle and optic.