Machined steel construction. Remove and reattach a scope and still return to within half an inch of the original point of impact on the target. Turn the lever forward and an eccentric on the lever shaft engages the base of the ring, pulling it down and forward on the base, locking it solidly into its "zero" position. Also available in Extension Rings. The characteristic that distinguishes the quick release mount system from the dual dovetail and STD systems is the ability to remove the scope from the rifle and reattach it without the loss of zero (within 1/2 MOA). Machined steel construction supremely-close machining tolerances. Features: Turn the lever forward and an eccentric on the lever shaft engages the base of the ring, pulling it down and forward on the base, locking it solidly into its zero position The key is super-close machining tolerances at the heart of the patented lever mechanism Forged and machined steel construction Our QR mount promises repeatable accuracy, remove and reattach a scope using our QR mount and still return to within half an inch of the original point-of-impact on the target Versatile, and available for many different rifles