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 Picatinny Rail adapter, lanyard assembly for adjuster caps, Trijicon logo sticker, LENSPEN, ACOG manual and warranty card. Length 9" Proofs Fog/Shock/Waterproof Series Riflescope Weight 36.90 oz Reticle Illuminated Red Chevron .308/7.62 BDC Objective 48mm Eye Relief 2.70" Coating Type Waterproof, Fogproof, Shockproof Field Of View 17 ft @ 100 yds Magnification 6x Optic Coating Multi-Coated Parallax Adjustment Illuminated Red Chevron 308 BAC