The Primary Arms Deluxe Extended AR-15 Scope Mount is ideal for shooting 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 1 inch tubes. Aluminum construction, durable matte black anodized finish. 2.52 inches of clearance between the rings. 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 1-year warranty.