Trijicon 100213 ACOG 4x 32mm Obj 36.80 ft @ 100 yds FOV Black Matte Finish Dual Illuminated Red Triangle

The ACOG is internally-adjustable, compact telescopic sights with Tritium-illuminated reticle patterns for use in low light or at night. It combines traditional, precise distance marksmanship with close-in aiming speed. This model is designed for use with the M16 family, every feature of its mechanical and optical design was chosen for a single purpose: to provide increased hit potential in all lighting conditions, without failure prone batteries.