The AD-RECON-SEW mount is made for putting high power glass onto a flattop style AR-15/ AR-10 or bolt action rifle. This is a straight up mount with no forward offset. The rings are spaced farther apart to fit long tube Night Vision and Thermal scopes such as the ATN THOR and similar scopes. The inside ring spacing is 3.86", outside ring spacing is 5.8". It is precision machined from 6061 T6 aluminum and finished in hard coat T3 Mil-Spec anodize. It features the Patented QD Auto Lock Lever system to accommodate both in spec and out of spec rail systems.Features: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.Precision machined from 6061 T6 Aluminum.Hard coat anodized for a lifetime of performance.Fully adjustable to fit both in spec and out of spec rail systems.