There's plenty of DIY options too. The XS big dot epoxies over the factory bead and lowers POI with slugs at short range. A cheaper option that I used was to drill a hole in the bottom of the brass front sight out of my guide gun and epoxy it over the bead. You can quickly find the height you need with simple methods like a piece of shrink tube over the bead, trim until POI/POA meet up. Fiber optic sights can be added this way too.
Another common factor I've seen time and time again, many relatively short barreled shotgun sling those slugs higher than your intended point of aim. So a standard bead does not suffice for this task. Two ways to address this, rifle type sights which take away from the shotguns quick shooting at flying bird characteristics IMO, or number two, maybe an elevated bead on a ramp or pedastel. In the 1990s Remington used to make these available straight from the factory. I don't know why they are not more commonly seen in the game fields.























































