Dave I have that same barrel on my flinter. I covered the front sight with a coating of white fingernail polish. It helps a lot removing that double vision blur us old timers get when using the fiber optic sights. The green dots on the rear don't bother me but that bright red front sight used to look like a figure 8. And the suggestion to use a black dot as your aiming point helps too.
That 21" barrel makes for a real handy rifle. Mine likes the 275 gr Maxihunters and 90 gr of FFFg.