These are for those who demand top stability. Totally integrated ring and mount system. Brownings integrated scope mount system unitizes the ring and base into a single, ultra-rigid unit. Machined from 7000 series aluminum alloy, they eliminate alignment problems and the possibility of a loose connection between the base and ring. Integrated scope mounts unitize the ring and base into a single, ultra-rigid unit Machined 7000 series aluminum that eliminates alignment problems and the possibility of a loose connection between bases and rings. Features: Machined from 7000 series aluminum for high strength and durability The integrated design eliminates alignment problems and the possibility of a loose connection between bases and rings