The Trijicon ACOG. 4x32 Enhanced Combat Optical Sight (ECOS) is designed for Special Operations forces of the U.S. military, but is available through civilian and law enforcement outlets as well. The Trijicon ACOG ECOS is the ideal sight for both close quarter battle (CQB) situations and longer distance shooting where accuracy and pinpoint bullet placement are required. This dual-sighting system gives the shooter a distinct tactical advantage with the option of either the Trijicon ACOG or the Docter Red Dot Sight. This rugged, dependable aiming system is available with a Bullet Drop Compensated (BDC) reticle calibrated to the trajectory of the .223 cartridge and provides precision aiming for targets out to 1,000 meters.