This Williams Gun Sight Company manufactured red fiber optic adjustable rear sight assembly with both mounting screws is for the Thompson Center Triumph in-line muzzle loading rifle and is in excellent condition with light wear.  (file photo)

Warning: You might want to purchase the Williams .445" high fiber optic front sight if your current front sight is shorter or taller so as to have proper alignment when sighting in your muzzle loader.

Note: Thompson Center Triumph muzzle loaders with the following serial numbers have been observed with this part:

Rochester, NH: 40043

Springfield, MA: