If you're going for a "handy-man" do it yourself fix...why not try a bigger thicker ring (you could even file/contour it to your slide) with a through hole and grub screw.
You could extend the through hole into the outer barrel and then you'd have a physical bond between the ring and the barrel. The grub screw would go right through the ring and into the outer barrel.
And/or freeze-heat fit. Size the ring so that it won't go on (just barely too small). Freeze the outer barrel. Heat the ring with a torch and press fit it on. Plan ahead for this type of stuff...you only get one shot at it.
It's amazing the pounding that these things take!
Make the ring out of gold anodized aluminum....then all the kids will be copying you...
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