The Diamondhead Polymer Integrated Rear Sight will mount easily on any Mil Std 1913 Rail, and is molded of an advanced polymer composite for strength, light weight and durability. The photo shows the sight deployed; from the rear; and folded flat. The NiteBrite Photoluminescent inserts can be charged by natural light, or a flashlight for improved low light shooting. The Diamond shaped aperture housing offers quick target acquisition. It features same plane, metal, dual short & long range apertures that are the same height as factory A2 sights. Windage adjustments are accurate to 0.5 MOA. Made in USA, and Lifetime Warranted by Diamondhead.