LOL... Good question. One thing I have found about Old Guns is you never know what "changes" they have gone through over the years from previous owners. Most of the Old Model Single Six's had a pressed in front sight but there were loads of variations. Soldering a sight in on a blued barrel is not a good idea. It's commonly removed by doing a partial disassembly, wrapping/padding the frame into a vise upside down. Then the underneath of the barrel is struck to knock the pin out. Epoxy should be used to secure the front sight back in place. It's not a difficult job for a gun smith or experienced "tinkerer" but like most things something to be avoided by a novice.