American Defense Manufacturing Cantilever ACOG Base Standard Legacy Lever Flat Dark Earth. 1" centerline height. It allows for a rearward position of the ACOG sight while clearing military issued back up iron sights such as the those supplied by KAC / MATECH. The AD-B3-C mount fixes the eye relief issue commonly found with mounting the optic traditionally. The reverse cantilever will allow the user to place the eye piece of the optic much farther rearward without interference. 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. Specifications for American Defense Manufacturing Cantilever ACOG Base: Manufacturer: American Defense Manufacturing Height: 2.1 in Gun Rail: Picatinny Fabric/Material: 6061-T6 Aluminum Weight: 2.8 oz Condition: New Fit: Trijicon ACOG Finish: T3 Mil-Spec Anodize Features of American Defense Manufacturing Cantilever ACOG Base 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. Features the Patented QD Auto Lock Lever system. Package Contents: American Defense Manufacturing Cantilever ACOG Base American Defense Manufacturing AD-B3-C-FDE-STD: Cantilever ACOG Base Standard Legacy Lever Flat Dark Earth