NCStar MARDRS A2 Back-Up Rear Sight AR-15 Black Aluminum/Steel

The NcStar AR-15 Detachable Rear A2 Iron Back-up Sight (dual aperture) is precision-made with aluminum and steel. The fixed A2 design is adjustable for windage and elevation, and it mounts onto Weaver and Picatinny-type rails. This 2.7"-long sight weighs just 5.1 oz.