The C-MORE Tactical sight mounts to all Colt M-16 / AR-15 rifles and carbines, including the M-4, that utilize a flat top upper receiver. By directly attaching to the upper receivers picatinny rail, the Tactical sight replaces the removable carry handle (if applicable) and also provides a replacement A-3 style rear aperture sight. The Tactical promotes extremely fast target acquisition by eliminating an obstructed field of view and allowing you to shoot with both eyes open in an enhanced peripheral view, while also enabling you to retain the use of your iron sights as a back up system and for longer yardage shots.