With very few exceptions, the 20ga was built on a 0 frame. As Brian alluded, it's possible to fit it with a lot of work. I'd start with setting the top tang in the stock, and bring the bottom of the stock up to meet the receiver, then thin the cheeks down, and reshape the cheek curve. The biggest reason for not doing it would be the proportions would be very heavy, and quite bulky looking.
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