Leupold Mark Integral Mounting System w/ 20MOA 1-Pc Base 34mm Ring Matte Black. This model is designed to fit your AR's MIL-spec 1913/Picatinny rail and any scope with a 34mm maintube. Its angled design also adds 20 MOA of elevation. Designed specifically for use with ARs IMS mounts features a forward cantilever design placing your scope forward on the rail to provide you will a full field of view. The mount also places the center of the optic 1.5 off the rail the same height as open sights on a classic AR making it easier to look through your scope without struggling to get low enough to the stock. Nothing is more crucial than the link between your scope and firearm. Thats why our mounts are every bit as rugged and dependable as the Leupold optics they secure. And with a huge variety of mounting systems to pick from you're sure to find the perfect match for your firearm and style of shooting. Guaranteed to hold up to a lifetime of abuse Leupold mounts will never let you down. Specifications for Leupold 176883 Mark Integral Mounting System With 20MOA 1-Pc Base & 34mm Ring Co: Manufacturer: Leupold Fabric/Material: Aluminum Ring Quantity: Pair Package Contents: Leupold 176883 Mark Integral Mounting System With 20MOA 1-Pc Base & 34mm Ring Co Leupold 176883 Mark Integral Mounting System With 20MOA 1-Pc Base & 34mm Ring Co