Featuring a dual illumination system, this Trijicon ACOG Riflescope - 3.5x35mm DI Green Horseshoe .308 Reticle TA51 Mount uses fiber optics to illuminate during daylight hours and Tritium to illuminate during the night. It also gives the shooter a larger field of view than conventional sights, and it is made to be lightweight yet sturdy, as it is made from forged aluminum. It can be mounted on most firearms in a matter of minutes.