ArmaLite's Scope Mounts provide outstanding, repeatable engagement with all MIL-STD 1913(Picatinny) rail systems, placing the scope centerline at the same position as the iron sights of a model A2 Rifle. Medium height and accept up to a 50MM Fits on AR-10, M-15, AR-30, AR-50 1.1875" from top of upper receiver to center of scope rings (approx.) Torque on the picatinny rail screws: 40 inch lbs