The ACOGs 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 ACOGs combine traditional, precise distance marksmanship with close-in aiming speed. Although the ACOGs have many features which are very advantageous for military use, they were developed by Trijicon without government funding.
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.

ACOG 1.5x24  with M16 Base, Amber  Dot Reticle and BAC. 

This model provides a large exit pupil (16mm) and long eye relief allowing for great freedom in eye position. This makes it extremely 
fast at acquiring targets at very close range while maintaining the added precision possible with 1.5x magnification.