The Primary Arms Deluxe AR-15 Scope Mount is ideal for M4, AR-15, and similar “flat-top” 1913 Picatinny mounting platforms. Aluminum construction, durable matte black anodized finish. 2.52 inches of clearance between the rings. 1-inch: Places the center of your 1 inch tube scope 1.5 inches above the rail. Fits scopes with 1 inch tubes. This tough mount features a lifetime warranty. 30mm: 2.52 inches of clearance between the rings. Places the center of your 30mm tube scope 1.5 inches above the rail. Fits scopes with 30mm tubes. This tough mount features a lifetime warranty.

To make sure that the mount nut is fully tightened, turn the nut clockwise until resistance is encountered. After that, turn another 1/2 turn. If a torque wrench is being used, they recommend no more than 35-40 in-lbs.