Trijicon 100103 ACOG 4x 32mm Obj 36.80 ft @ 100 yds FOV Matte Black Finish Illuminated Red Crosshair 223

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's design is 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.