Optical Sight Mount for use with Aimpoint® Micro T-1, H-1 and R-1 Red Dot Reflex Sights. Low Height Above Bore Weapon Rail Compatible (Shotgun, AK 47, PS90, Pistol, etc.)General Features:? For use with Aimpoint® Micro T-1, H-1, and R-1 Red Dot Reflex Sights? Retains Zero under extensive live fire usage and while subjected to harsh mechanical stresses: .01 MOA? Returns to Zero following repeated removal-remount cycles during extensive live fire usage: Value: .01 MOA [Lab Tested] < .20 MOA [Live Fire]? Adjustable to Out-of-Spec / Worn M1913 Picatinny Rails? Auto-Locking Quick Detach™ (ALQD™) Lever System? Non-Abrading / Gouging Picatinny Rail Lockdown Feature GDI MT1-OSM Optical Sight Mount MT1M