The new streamlined design with QD mount insures MOA re-mount capability and allows for use of back up iron sights while maintaining proper eye-relief. Available in 30, 34 and 35-mm options with Burris? Signature polymer ring inserts, it provides adjustment from 5 to 40 MOA without using windage/elevation knobs.Features:Quick Detach Features;Allows for Back Up Iron Sights While Maintaining Proper Eye Relief;Ensures .25 MOA Re-Mount Capability;Cantilever Design;Burris? Signature polymer ring inserts