Thank y’all so much for the welcomes!! It screws into the barrel. I just traded for this rifle and didn’t realize until we had made a deal that the rear sight was gone. I used to shoot black powder for a long time but I had an accident and broke my neck and couldn’t do very much. Had to sell all my stuff to keep the lights on but God’s grace is sufficient. 8 years later and I am walking without a walking stick now. Hoping to get this old .54 to smokin again! Another question, the barrel has some surface rust on it and around the nipple area. I was thinking about refinishing and rebluing it but I am thinking about browning it. What’s y’all opinions on browning and old T/C? Again, thanks for the welcomes. Ole Scratch