Affordable, injection-molded folding front and rear back-up sights. Elevation-adjustable front sight has a built-in, spring-loaded post detent. (Note: Polymer construction not compatible with railed gas blocks.) Dual aperture rear sight is adjustable for windage. It’s tailored to the AR-15 platform. Fits all mil-spec 1913 Picatinny rail-equipped weapons. Available: Front, or Rear.