You receive enhanced precision and pinpoint accuracy when using the Trijicon ACOG 4×32 Red-Chevron BAC Flattop Reticle & Flat Top Adapter. This rifle scope by Trijicon is designed to be zeroed in using the tip at 100 meters and the width of the chevron at the base is 5.53 MOA which is 19 inches at 300 meters, allowing for range estimation on silhouette targets. The TTrijicon ACOG 4×32 Red-Chevron BAC Flattop Reticle features Dual Illumination, a fiber optic that provides daylight illumination and tritium illuminated reticle at night, and the ranging reticle is calibrated for 5.56mm (.223 cal) flat-top rifles out to 800 meters. Trijicon TA-31F 4x32mm ACOG Advanced Tactical Optical Gunsights hit fast in any light, are internally-adjustable, compact telescopic sights with tritium illuminated reticle patterns for use in low light or at night. The Trijicon ACOG 4×32 Rifle Scope w/ Flat Top Adapter is designed for use with the M16 family and every feature of its mechanical and optical design was chosen to provide increased hit potential in all lighting conditions – without failure-prone batteries.