Trijicon ACOG BAC 3.5x 35mm Rifle Scope - Horseshoe Dot - ACOG 3.5x35 Scope with Green Horseshoe BAC Reticle-includes Flattop Adapter. Features dual illumination (Fiber optics provides daylight illumination and tritium illuminates reticle at night). The ranging reticle is calibrated for 7.62(.308 cal) flattop rifles out to 1200 meters. Superior quality glass lenses Combat proven Fixed magnification Rugged aluminum alloy housing Both eyes open design