Yes the post are loose, they ring when tapped and you can see the rib move no more than a couple thou of an inch, but is solid on both ends. My old gunsmith friend who has passed, had a process that he used high strength black loctite epoxy to reapply ribs and never had one come lose, and never screwed up the bluing made a jig that had clamps that moved so he could apply pressure on top of each post! I was hoping for an non evasive solution to my Ruger, but looks like from you nice CGN'rs that a total reblue and relaying of the rib,. I'll contact Ruger warranty first, but looks like the 28ga will take a trip to Briley in Texas as not heard of anyone in Canada who does this work.
Wendall I don't think a 27 year old Ruger firearm would still be warranteed by Ruger, thanks for reply my friend! Thanks to all replies my friends, cheers,Dale Z!