Whether it's an FN SCAR or a standard AR-15, mounting an optic on a flattop rail requires the use of a high-quality optics mount that securely connects the rifle to the glass. Otherwise, your complete rifle system won't perform when the critical moment comes. This American Defense Delta Scope Mount is built to provide that all-important connection. Each American Defense Delta Scope Mount is incredibly light and strong, since it's made entirely from 6061-T6 aluminum. Designed specifically for use on flattop AR-15 receivers, this mount features the same ring spacing as the company's Recon mount and features a 1.5-inch center-line height when used with 30mm rings. Center-line height decreases to 1.475 inches when used with 1-inch scope rings. The other highlight of this American Defense Delta Scope Mount is the use of the company's patented QD Auto Lock Lever system, which ensures a solid lock on any compatible Picatinny rail, even if the rail itself is slightly out of spec. The mount requires no special tools for adjustment, and the lever can be set to lock at the front or rear of the rail surface.