The AD-RMR-OFFSET mount will place the optic on the Right Side of the rifle. The mount requires A 1/2 of clearance under the scope tube or eye piece to fit under the scope. The base is 1.35" long. The 45 degree offset is for use with scopes with large adjustment caps. It features the Patented QD Auto Lock Titanium 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.Hard coat anodized for a lifetime of performance.Fully adjustable to fit both in spec and out of spec rail systems.