The Trijicon ACOG (Advanced Combat Optical Gunsight) is a combat-proven 4x32mm fixed power riflescope featuring an illuminated amber crosshair reticle optimized for .223 caliber ammunition. Built with black hardcoat anodized finish this compact optic delivers reliable performance in all lighting conditions.Trijicon ACOG Model 100091 Riflescope4x magnification with 32mm objective lensIlluminated amber crosshair reticle for .223 caliberBlack hardcoat anodized aluminum housingFixed power design for durability and reliabilityBoth eyes open shooting capabilitySuperior quality glass lensesBullet drop compensated (BDC) reticle systemEngineered for professional and tactical use this ACOG combines precise long-range marksmanship with close quarters battle speed providing increased hit potential from bright daylight to low/no light conditions.