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.