American Defense Manufacturing Holosun 510C w/Co-Witness Red Dot Mount Standart Lever Black. 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 Holosun 510C w/Co-Witness Red Dot Mount: Manufacturer: American Defense Manufacturing Finish: Anodized Gun Type: Rifle Fabric/Material: 6061-T6 Aluminum Co-Witness: Absolute Base/Mount Type: QD mount Red Dot Sights-Footprint: Holosun 501C Optic Cut: Holosun Hand: Ambidextrous Length: 3.2 in Width: 1.6 in Height: 1.54 in Features of American Defense Manufacturing Holosun 510C w/Co-Witness Red Dot Mount Standart Lever 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. Package Contents: American Defense Manufacturing Holosun 510C w/Co-Witness Red Dot Mount Standart Lever American Defense Manufacturing AD-510C-10-STD: Holosun 510C w/Co-Witness Red Dot Mount Standart Lever Black