The AR-15 fixed rear sight mounts at the rear of the rifle and gives shooters a consistent aiming reference. It is a non-folding iron sight that stays in place for a permanent sighting setup. Shooters pair it with a front sight post for proper target alignment. The sight fits standard Picatinny and Weaver rail systems on AR-15 upper receivers. It works well for traditional iron sight setups and as a backup option on optic-equipped rifles. An AR-15 fixed rear sight offers reliable, always-ready aiming on any build.