Papa, I had to make the rear sight bases out of bar stock. The 3 blade express sights were commercial ones available at one time from SARCO, but I think they are all gone now. They are marked 100,200 and 300 but on my Irish rifle (the one I will keep) I hand-made another fixed sight and soldered it to the base behind the folders, so the 100 is now zeroed at 200, the 200 at 300, and the 300 at 400. The sights on the SMLE were marked 100, 200 and 300, and because it was going to be for sale, I didn't add the fixed sight and I though it would be best to have them zeroed as marked.
Both rifles are zeroed for 180 grain bullets at 2400 FPS.

The fixed sights is zeroed at 100. The front sight base and sight itself are Williams brand, and I bought them from Brownells.