Abstract: A gun sight optic contingency system is mounted co-witnessed with a red dot sight onto a firearm. The red dot sight has a sight window that remains functionally unobstructed. The gun sight optic contingency system has a low profile rear sight located proximal to a shooter, and a front sight located distally to the shooter. The rear and front sights together define a sighting axis aligned with the path a fired projectile takes. Amounting, such as an adapter plate, couples to the firearm. When aimed at a target, the front sight is visible within and adjacent to a bottom of the view visible in the sight window. The rear sight is outside of and adjacent to a bottom of the sight window and also adjacent to and just below the front sight view in the sight window. The front and rear sights may contain a luminescent compound.