I used to do a lot of squirrel hunting with a 36 cal SMR. I had a regular squirrel jihad going on for a while back in Caintuck. Silver, German Silver, Iron, Brass all didn’t get it for me so I finally made an iron blade and used a slitting saw and slit the face of the sight, then inserted a sliver of ivory. That was the ticket. The black or brown of the iron stood out in lighted conditions and the ivory took care of the dark conditions. It worked so well I modified a big single shot this same way. Another method to do the same thing is to drill a hole in then sight and slip in a rod of ivory but this seemed like a mess to me! I made the sliver fit the slot tight, its never moved on either gun.
Ed