Trijicon H&K USP Compact HD Front Outline Night Sight Set, Orange. These night sights are built for tactical shooters who need fast target acquisition in any lighting condition. The front sight features a taller blade with an aiming point surrounded by photoluminescent paint that glows in dim light, helping you acquire your front sight quickly during transitional lighting. The rear sight has a wider U-shaped notch outlined in black to enhance focus on the front post, and the steeply angled front surface allows for emergency one-handed slide operation. Tritium-filled lamps provide continuous illumination without batteries in complete darkness or low-light environments.