Without actually seeing it, my guess is that you probably will want to replace the factory sight screw wirh what is known as a "blanK" screw. They will pretty much match the contour of your barrel. You should be able to pick one up at your local gun dealer if they do any repair work at all, or places like Brownell's carry them too. You will need to determine the screw size and thread pitch in order to get a proper replacement. Some of the reloading supply people (Midsouth, etc.) may carry them in screw repair kits, which are very handy to have around. Good luck....