There is a Facebook group named “K31 & Schmidt Rubin” that has some good info. Good luck on finding diopter sights, they aren’t cheap! I tried one of those receiver clamp-on scope mounts for a minute, didn’t like the fit. I bought it from a small booth at the NRA show, I think it was junk. I too struggle with seeing the iron sights. I want to try an S&K scout scope mount which replaces the rear iron sight. I think a scout scope will really show the accuracy of my K31.
