illuminated that facilitates a sighting of the bow during its usage the back end of the fiber optic f extends through a further cavity 7 and into which the back end of the fiber optic locates to be exposed to the illumination means at the side of the holder is also provided a further cavity as at 8 and it is within this cavity that a capsule 9 of radioactive gas such as the type as previously explained namely a capsule of a small quantity of tritium or other radioactive gas in gaseous form locates these particular capsules of tritium or other radioactive gas as previously explained are furnished encapsulated within a metal casing or sphere and which have a pin hole in them for allowing the illumination from this source to generate and in this particular instance the capsule 9 locates within said cavity 8 and its pin hole emission point is directed towards the small passage 10 located between the cavity 8 and the cavity 7 so that the light emitted from the capsule will be reflected onto the adjacent back end of the fiber optic pin sight since this type of fiber optic is of the scintillating type it may absorb light even along the length of its surface and direct such light internally of the fiber optic to its tip t normally located at the back end of the bore 6 and into which the fiber optic was previously emplaced a further embodiment for the pin sight of this invention is shown in fig6 this particular holder includes a fiber housing 11 having an opening 12 provided there through and the upper tip 13 of the strand of fiber optic 14 is located approximately centrally of the opening 12 to facilitate sighting by the.