The Trijicon ACOG dual illumination sight is world renowned for reliability and accuracy in the toughest combat conditions on the planet. The numerous advantages of using a battery-free optical sight that is always on and that automatically adjusts for lighting conditions has made the ACOG one of the preferred gunsights of the US armed forces. Fiber optics and tritium vials create a bright aiming point that is easy to pick up with both eyes open, at distance or close range, for accurate and rapid target engagement.