The Acog’s are internally-adjustable, compact telescopic sights with tritium illuminated reticle patterns for use in low light or at night. Bindon Aiming Concept (BAC) models feature bright daytime reticles using fiber optics which collect ambient light. The Acog’s combine traditional, precise distance marksmanship with close-in aiming speed. Although the Acog’s have many features which are very advantageous for military use, they were developed by Trijicon without government funding. 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.