This Thompson Center manufactured third variation fiber optic adjustable metal rear sight assembly is for the Black Diamond in-line muzzle loading rifle and is in very good condition with light wear. The mounting screws are sold separately. (file photo)

Note: Thompson Center Black Diamond muzzle loading rifles with the following serial numbers have been observed with this part:

Blue Finished Black Diamond: 33685 35546, 52894, 58444, 58629 & 90912

Stainless Steel Black Diamond: S8052, S34981, S37202 & S44770

Blue Finished Black Diamond XR: R30285