Lightweight integrated scope mount system for the AB3 rifle unitized base and ring 7000 series aluminum. AB3 only. – Integration means stability. 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 y.our needs. THESE INTEGRATED RINGS ONLY FIT AB3 RIFLES – Precision and strength. – 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