The AD-DELTA-20 mount is made for putting high power glass onto a SCAR or flattop style AR-10. The AD-DELTA-20 is a straight up scope mount with no eye relief built in but does have 20 MOA built in. Top rail to scope center line height is 1.475" for 1" rings and 1.5" for 30mm Rings. It is precision machined from 6061 T6 aluminum and finished in hard coat T3 Mil-Spec anodize. Horizontal rings. Adapted to the FN SCAR program; approved by SOCOM. It features the Patented QD Auto Lock Lever system to accommodate both in spec and out of spec rail systems. For 30mm rings.