I don't believe the Gaugemates had a rubber o ring. Those were Chambermates. At least all the Gaugemates I've had or still own never had o rings. The Golds came in a soft case with a brush and tool to remove them. They also had part of the lip removed so they could be used with ejectors. They also cost 150 compared to the $50 " Silver " Gaugemates. I only got bit one time. After that I'd just grind off a 1/4 of the lip and have the same thing without the little accessory pack. At one time I had 12/28 and they worked of skeet ok. I never did understand how the bore could be so much bigger and still work. Guess everything happens within the shell. They aren't made anymore. The last I knew was they only were making adapters for pistols or rifles.
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Paul Harm
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