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 if 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. Includes a thumbscrew flattop adaptor, 4x32 Scopecoat, LENSPEN, lanyard assembly for adjuster caps, Trijicon logo sticker, ACOG manual and warranty card.