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. Features outstanding clarity, rugged housing, always on- always ready, and 'both eyes open design. Includes Picatinny Rail adapter, Trijicon logo sticker, LENSPEN, ACOG manual and warranty card.