Trijicon 100091 ACOG 4x 32mm Obj 36.80 ft @ 100 yds FOV Matte Black Finish Illuminated Amber Crosshair 223

The ACOG is an 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. 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.