eightbore, I came to the tube sight while trying to create an aperture sight for my flintlock rifle. I've been hunting with it a lot during PA's late season and realized my difficulty seeing the partridge type sights. While working on a rear aperture, that I have installed but have yet to test, I had a piece of cut off aluminum arrow shaft and looking through it realized the good sight it might make. I then remembered seeing a tube sight on an original flintlock rifle somewhere. I also came across some Martinis with tube sights in my research.
