Armson O.E.G. Red Dot Reflex sights have been the choice of military, law enforcement, and sporting users for over 35 years. Both eyes remain open for instant target acquisition, improved depth perception, and no loss of peripheral vision. The Armson Aiming Concept instantly merges the dot and target. A fiber optic light source provides illumination during the day and the optional Tritium upgrade self-powers the sight at night. No batteries required. Constructed of 6061-T6 aluminum with matte black anodized finish.