I have a 12 GA Parker DH with 2 1/2" chambers that I fit with a set of Briley Universal 20 GA tubes meant for 2 3/4" chamber. A little careful grinding at the forward end of the Briley chamber area and final polishing. They work great. I don't know why you couldn't do the same with 28 or 410 GA tubes.
Bob Jurewicz
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