The Leupold Integral Mounting Systems (IMS) family quickly and easily eliminates the two most common issues faced when mounting standard riflescopes to AR-style rifles; scope height and eye relief. Features: Weight (oz) 5.9 Length (in) 5.74 Rear Offset (in) .38 Ring Depth (in) .65 Length Within Rings (in) 3.68 Ring Width (in) 1.98 Ring Height (in) 1.5 Specifications: – Manufacturer Leupold – Length 5.74" – Model Integral Mounting System – Mount Height 1.50" – Mount Type Picatinny Rail – Package Height 2.6 – Package Width 4.9