This Williams Gun Sight Company manufactured WGRS Twilight aperture style receiver peep sight with both mounting screws is for the Savage model 10, 11, 16, 110, 111 and Axis bolt action rifle with a round receiver and hole spacing .860" apart (center to center). This sight is in new condition.  (file photo)

Note: Williams Gun Sight Company recommends using their .538M front sight in conjunction with this receiver peep sight

Note: This is a CFnParts exclusive non-catalogued Williams Gun Sight Company manufactured receiver sight