Keep your investment in a Nikon® Rifle Scope solid by using a BLACK Cantilever Mount to secure it to your rifle. Nikon BLACK Series one-piece mounts are precision machined to incredibly tight tolerances for strength and precision on AR/MSR rifles. This design with 20 MOA Slope creates proper alignment and maximum surface contact area for your 30mm tube rifle scope. Mil-spec 1/2" hex nut clamp fastens using only 65 in.-lbs. of torque.