I have an Encore 209x50 Muzzle loader barrel. I got it from a guy a while back at a good price...I got it out this year for Deer season and cleaned it up. It has a scope base on it and it has the small set screws in where the rear sight used to be...I took the screws out where the rear sight used to be..One of the holes goes all the way through to the inside of the barrel. So now what do I do..I did contact the guy and he said he shot it and it never messed up on him, but knowing my luck it would blow up on me. So how do I fix this ?? I really don't want to just put the screw back in and fire away !! He did have lock tite on the threads but I don't want to go back down that road....any suggestions on how to fix this ?? I do Gunsmithing on the side and have built several 10/22's and Glocks but I have never run into this problem...I can't tell if the guy messed up the thread and decided to retap the hole with a larger tap. If he did he got carried away with the drill and went all the way through..I looked inside the barrel and it is clean and has no marks inside....HELP ME !!!