New and unique improvements of prior known fiber optic sights for firearms with day and night time capabilities are disclosed that comprise (A) a sight base, (B) a fiber optic rod mounted in said base having an angle cut at the distal end which is positioned on the underside of the rod, and (C) an artificial light insert that is positioned in a cavity in the fiber optic rod. The cavity is sealed with a fiber optic rod plug and epoxied using an optically clear epoxy. The sight provides increased light output, co-located day and night sight views with increased illumination during the day, and uses a low power tritium insert for night time use. At night the sight achieves a transition from a bright ring during the day to a small central dot at night while maintaining the same color light for both.