Primary Arms Deluxe Extended AR-15 Scope Mount, 30mm Scope Mount, Fits 30mm Main Tubes, 1.5 Height, Anodized Finish, Black PA-PLX-CM-30-2.04-C The Primary Arms Deluxe Extended AR-15 Scope Mount is ideal for mounting a variable-power optic in the "nose to charging handle" position on M4, AR-15, and similar "flat-top" 1913 Picatinny mounting platforms. It's a great option for 1-4x and 1-6x scopes with 30mm tubes. Aluminum construction with a durable matte black anodized finish. 2.28 inches of clearance between the rings. Places the center of your 30mm tube scope 1.5 inches above the rail.