The Trijicon ACOG model TA31DOC combines the technology of the Trijicon ACOG (4x32) gun sight with the Docter Optic Red Dot sight. The TA31DOC is an internally adjustable telescopic sight powered by Trijicon's fiber optics and tritium-based technology. Its dual-illuminated reticle is designed to hold zero under the most extreme conditions and present a bright aiming point in all lighting conditions providing excellent long-range precision targeting or even faster short range target selection using the Bindon Aiming Concept (BAC). With the Docter Optic 1x red dot sight mounted on top of the Trijicon ACOG TA31DOC, this sighting system provides the user with fast target acquisition in CQB situations while allowing for excellent situational awareness.