I put the Briley 4" extensoon on mine with a =6 Nordic tube. Then added a fiber optic replacement front sight insert. Forgot the brand but there are a bunch of replacements out there. On the ghost ring I cut the top of ring off just to the top of the two side dots. So I have ajustability if needed as the original rear sight is adjustable. For slugs I line up the front dot with the back ones. For everything else as soon as the front dot comes any where near the big U from the cut off ghost ring I fire. I have found this very fast.
Good luck...John