Material: 6061 T6 Aluminum Finish: Hard coat T3 Mil-Spec anodize Ring Size: 30mm Eye Relief: 2 inches Optic Centerline Height: 1.5 inches Weight: 8 oz | Lever System: Patented QD Auto Lock™ Compatibility: Most 1913 Picatinny-style rails Color: Flat Dark Earth (FDE) SKU: AD-DELTA-C-30-FDE-STD Base #: 1415B |