OK we were speaking different type of Fiber optic sights. You want Iron sights you can see not a FO tube type of sight. I did not understand that from your posts as most guys in this situation are switching to tube sights. Then what you need is a custom front sight set up to take fiber optic inserts. I played with these a few years back on a modern muzzleloader. Going to cost a few bucks but it will work fine. Not very durable though. I kept breaking them. Just carry extra and a lighter in your pack.
https://www.brownells.com/handgun-parts/...ent=080-000-729
