The Trijicon ACOG (Advanced Combat Optical Gunsight) is a fixed power, compact riflescope with an illuminated reticle designed for a single purpose: to provide increased hit potential in lighting conditions. The Trijicon ACOG combines Close Quarters speed with distance marksmanship. Many variants in... Read Moreclude a bullet drop compensated (BDC) reticle. The ACOG is designed to be extremely durable and reliable and is used by the U.S. Military daily in the harshest conditions. Read Less