Trijicon 100173 ACOG Black Hardcoat Anodized 5.5x50mm Illuminated Red Chevron .

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 adaptor, 5.5X50 Scopecoat, LENSPEN, lanyard assembly for adjuster caps, Trijicon logo sticker, ACOG manual and warranty card.