The M150 is an Advanced Combat Optical Gun sight (ACOG) designed for the US military's M4 and M16 weapon system. It incorporates dual illumination technology using a combination of fiber optics ...

The Trijicon ACOG. 4x32 Enhanced Combat Optical Sight (ECOS) is designed for Special Operations forces of the U.S. military, but is available through civilian and law enforcement outlets as well.