Trijicon ACOGs are internally-adjustable, compact telescopic sights with tritium illuminated reticle patterns for use in low light or at night. The Bindon Aiming Concept (BAC) scopes feature bright daytime reticles that use fiber optics to collect ambient light and automatically adjust the brightness to meet available light conditions. The ACOGs combine traditional, precise distance marksmanship with close-in aiming speed. Every feature of each scope’s mechanical and optical design was chosen for a single purpose: to provide increased hit potential in all lighting conditions—without failure-prone batteries.