The MBUS Pro Rear Sight is a corrosion-resistant all-steel back-up sighting solution that delivers maximum functionality and strength with minimum bulk. It features a dual aperture rear sight with windage adjustment and no-tool elevation adjustment for the MBUS Pro system, designed for installation on 1913 Picatinny rails including rail-height gas blocks. Positive detents keep the MBUS Pro Front and Rear at standard AR sight height when deployed and low when stowed. The narrow front width accommodates most IR aiming lasers and light installations.