Your options are limited for actual sleeving. Merrington maybe and Aaron Little. Getting tubes is more of an issue these days.
Briley tubes would really be your best option. It will be cheaper and the outside of the barrels will still be original in appearance. And you would be 20g either way.
I understand your concern, but if you have been shooting the gun all along and have had no issue, why not just continue to do so?
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B. Dudley
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