USED Leupold Mark 4 AR 30mm Integrated Mounting System Black. It is made to fit any AR-style rifle with a standard Picatinny (MIL-STD-1913) rail and any scope with a 30mm diameter main tube. This IMS solves the common challenges of mounting a standard riflescope on an AR platform - specifically proper scope height and eye relief. The Mark 4 AR 30mm Integrated Mounting System (IMS) features a forward cantilever design that pushes your scope out for improved eye relief and a full field of view. It positions the optic 1.4in above the rail (the same height as standard AR iron sights) which makes it faster and more natural to get behind the optic. Like every Leupold mount it's built to be as rugged and dependable as the Leupold optics it holds. It s guaranteed to perform for life this is the link between scope and rifle you can trust in all conditions. Specifications for Leupold Mark 4 AR 30mm Integrated Mounting System: Manufacturer: Leupold Fabric/Material: Aluminum Offset: 1.75 in Gun Make: AR Platform Color: Black Distance Between Rings: 3.46 in Base/Mount Type: Cantilever Ring Mount Tube Diameter: 30 mm Ring Height: 1.4 in Super High Length: 5.43 in Weight: 6.05 oz Width: 1.77 in Ring Top Torque: 28 in-lbs Package Contents: Leupold Mark 4 AR 30mm Integrated Mounting System Leupold 182860: Mark 4 AR 30mm Integrated Mounting System Black