This Williams Gun Sight Company manufactured green fiber optic .445" high short ramp front sight is for the Thompson Center Impact in-line muzzle loading rifle when used with the Williams red fiber optic rear sight assembly and is in excellent condition with light wear. The mounting screw is sold separately.  (file photo)

Note: Thompson Center Impact muzzle loading rifles with the following serial numbers have been observed with this sight: 14508 & VTX8549