Trijicon ACOG 4x32 Scopes with Green Dual Illumination & BAC- M16/AR15. Features Dual Illumination (Fiber Optic provides daylight illumination and tritium illuminates reticle at night). The reticle ranges out to 800 meters for 5.56 (.223 cal). FeaturesALWAYS ON, ALWAYS READY - Most ACOG models are battery free, featuring a tritium/fiber optic illuminated reticle that automatically adjusts the brightness based on available light.TAKE CONTROL - Several ACOG models are designed with a user adjustable brightness setting powered by a single AA battery. The 3.5x35 LED and 4x32 LED models both offer six adjustable brightness settings.RUGGED, RELIABLE HOUSING DESIGN - Fixed-power design allows for minimal moving parts to create a nearly indestructible sighting system."BOTH EYES OPEN" DESIGN - "Both eyes open" shooting using Trijicon's Bindon Aiming Concept (BAC) feature allows for improved situational awareness.OUTSTANDING CLARITY - The quality of the glass and multi-coated lenses maximize ...