The Trijicon HD Night Sights were designed to meet the needs of modern tactical shooters. Three-Dot green tritium night sights work in tandem with a yellow photoluminescent outline on a tall front sight blade. Additionally, the rear sight features a U-Notch for fast sight acquisition. This setup allows for increased speed and visibility in various lighting scenarios. The serrated rear sight aids in glare reduction while its front surface is steeply hooked for emergency one-hand slide operation. Trijicon HD Night Sights include green tritium-phosphor lamps that are backed by a 12 year warranty from the date of manufacture.