CMC5-OSM(TM) (Optical Sight Mount) M4 / M16 / AR Compatible Absolute Co-witness: Front sight post tip in-line w/ red dot reflex sight Optical Sight Mount for use with AimpointA(R) CompM2 (M68 / CCO) / CompM3 Red Dot Reflex Sights / VortexA(R) Strikefire & Strikefire II Materials: CNC Machined Aerospace Grade Aluminum Stainless Steel Finish: MIL-SPEC Type III Hardcoat Anodize Category: Patent Pending FEASTURES: For use with AimpointA(R) CompM2 (M68 / CCO) / CompM3 Red Dot Reflex Sights / VortexA(R) Strikefire & Strikefire II 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] Adjustable to Out-of-Spec / Worn M1913 Picatinny Rails Auto-Locking Quick Detach(TM) (ALQD(TM)) Lever System Non-Abrading / Gouging Picatinny Rail Lockdown Feature Lightweight Rugged Design American Made