I mounted a Williams WGOS rear sight on another make of shotgun barrel with J-B Weld, and fifty rounds later, it is still on the barrel. I have often thought that the 28" standard barrel on my Pardner would make a good smoothbore slug barrel if only it had rifle sights. Am keeping an eye out for a spare barrel to try it out, and will J-B Weld a Williams aperture rear, and soft-solder a Shorty ramp for the front. I think J-B Weld will do the trick.