American Defense Manufacturer's AD-RECON-SEW Scope Mount is an ideal option for attaching high-powered, magnified optics onto flattop AR15/AR10 rifles, as well as bolt-action rifles with picatinny rails. The AD-RECON-SEW scope mount's rings are positioned further apart, allowing long-tube Night-Vision and Thermal devices (such as the ATN THOR) to be used. The interior ring spacing is 3.875" and the exterior ring spacing is 5.8". In addition, the AR-RECON-SEW scope mount is precision machined from solid 6061-T6 aluminum, and is given a T3 Mil-Spec anodized finish to ensure maximum resistance to corrosion and the elements. Features of the AD-RECON-SEW Scope Mount: Does not require proprietary tools for adjustment. Can be adjusted with your finger or a flat blade screwdriver. Lever can be configured to lock to the front or the rear. Superior clamping surface to insure maximum rail engagement. ADM AD-RECON 30mm Dual QD FDE Scope Mount w/Vertical Split Rings, No Offset & Extra Wide 3.875" Ring Spacing AD-RECON-SEW-30-FDE-STD