Flip it up when you need an iron sight, close when you don't need it or need your secondary scope. Features an integral picatinny mounting and thumb nut for quick and easy install and detachment.  Two aiming apentures for different shooting distances.  Mechanical windage adjustment allows you to mode apenture to the right or left.  The Flip-up Posi-lock Design keeps you rear sight in the position you set it, either up or down during the most extreme play.