Browning's integrated scope mount system eliminates alignment problems and the possibility of a loose connection between the base and ring.The ring and base become a single, ultra-rigid unit machined from 7000 series aluminum alloy.The x-lock scope mounting system that uses four screws per base, replacing the traditional two-screw system.Model: Integrated Scope Mount SystemStyle: 2 PieceFinish: MatteMaterial: 7075-T6 AluminumPieces: AluminumMount Type: X-LockRings Included: YesRing Height: Low