The Diamondhead USA Polymer Diamond Front Sight features the Diamond-shaped upper housing that is fitted with a NiteBrite photoluminescent insert. Designed for use with AR15s and Modern Sporting Rifles. Made from an advanced Polymer/Composite construction for?strength, light weight & exceptional durability. The NiteBrite Photoluminescent Insert (a low-cost alternative to Tritium) can be charged by natural light or with a flashlight. The sight is spring-loaded and flips up quickly with the push of a button and stays securely in place when deployed or when folded flat. Dual same plane long and short range apertures at exact same height as factory A2 sights. Easy tool-less elevation adjustment.