Years ago I had Andy from Skinner sights make me up the first Skinner Alaskan for my Marlin 45-70. The front sight is a flat post with a white line up the middle by XS Sights. A good set up for a hunting 45-70.
If it was mainly for bear protection here in Alaska I would go with a wide V with a tritium center line like the old British Express sights on my short barreled Rem. 870 and a Standard Dot XS front sight with a tritium insert.
I see better in low light with open sights compared to a peep with a big aperture.
I'm not sure who designs iron sights for rifles. Ruger comes close, but...........
I found that with a little help from a moto-tool I can convert the buckhorn sights to a shallow V. I’m going to try that on my Rossi 45 Colt.
