CM5-OSM (Optical Sight Mount) Quick Overview Optical Sight Mount for use with Trijicon RMR Red Dot Reflex Sight CM5-OSM (Optical Sight Mount)M4 / M16 / AR CompatibleStandard Co-witness: Front sight post tip in-line w/ red dot reflex sight Description: Sight mount for AimpointA(R) CompM4 / CompM4S (M68 / CCO) Red Dot Reflex Sights Materials: CNC Machined Aerospace Grade AluminumStainless Steel Finish: MIL-SPEC Type III Hardcoat Anodize General Features 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 Lightweight Rugged Design American Made