This Remington manufactured late variation rear sight assembly includes the aperture, slide, elevation (Allen hex) screw, windage screw, and (hollow) base (base mounting screw sold separately). This rear sight assembly is for the model 7400 semi-auto rifle and is in excellent condition. (file photo)

NOTE: Remington model 7400 semi auto rifles with the following year/serial number have been observed with this part: B8434918