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 4x32 Scope with Yellow Center Illumination for M4A1 - includes Flat Top Adapter, Backup Iron Sights and Dust Cover.

The TA01NSN-DOC combines the technology of the battle-tested Trijicon ACOG (4x32) gun sight with the Docter Optic Red Dot sight. 
This provides shooters the option of quick acquisition close range sighting with the Docter Sight and the precision for longer range 
shooting with the Trijicon ACOG 4x32.