Trijicon ACOG BAC 3.5x 35mm Rifle Scope - Crosshair - ACOG 3.5x35 scope with Red Crosshair Reticle-the ranging reticle is calibrated for 7.62mm (.308 cal) flat-top rifles to 1200 meters. Includes Flat Top Adapter. Daytime illumination is provided by fiber optics and Tritium illuminates the scopes at night. Superior quality glass lenses Combat proven Fixed magnification Rugged aluminum alloy housing Both eyes open design