The Primary Arms Deluxe AR15 Scope Mount is ideal for M4, AR15, and similar “flat-top” 1913 Picatinny mounting platforms. 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. Optional railed top caps are available in singles or pairs (product codes PA1RTC and PA1RTC-PAIR). Fits scopes with 1 inch tubes. This tough mount features a 1-year warranty.