Integration offers strength and consistency. Browning's 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. They are available in .400 Standard height .500 Intermediate height and .600 High height versions to fit your needs. - 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 - .400 Standard height .500 Intermediate height .600 High height - 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.