The Trijicon ACOG 3x24 Scope is a fixed magnification riflescope with an illuminated reticle pattern for use in any lighting conditions. Dual illumination provides two sources of battery-free illumination - fiber optics and tritium. The fiber optics use ambient light to automatically adjust the brightness level and contrast of the reticle to available light conditions. The tritium-phosphor lamp glows in low-light conditions. The ACOG body is designed to be extremely rugged and reliable. The forged 7075-T6 aircraft-grade aluminum alloy housing provides for a nearly indestructible sighting system. No other magnified optic has been used more in combat than the Trijicon ACOG. Mounting b Mfg: Trijicon