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. Includes a thumbscrew flattop adapter 4×32 Scopecoat LENSPEN lanyard assembly for adjuster caps Trijicon logo sticker ACOG BAC manual and warranty card.