Browning AB3 30mm Low Scope Ring - Matte Black - 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. Only Compatible With Browning AB3 Rifles. 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" Low Height