Shop Palmetto State Armory for all your optic needs! The ACOG remains a favorite of law enforcement and military personnel for a reason. Ease of use, reliability, and fast target acquisition set the ACOG in a class of its own. The ranging reticle is calibrated for 5.56 (.223 cal) flat-top rifles to 800 meters. The chevron reticle is designed to be zeroed using the tip at 100 meters. The width of the chevron at the base is 5.53 MOA which is at 19"; at 300 meters. This allows range estimation for silhouette targets. The Green Chevron reticle provides a brighter point of aim than the standard red reticle which will insure positive target acquisition in all light conditions. There are many imitators but only one ACOG, see for yourself why this optic is considered the absolute best in tactical optics.