All Mossberg 500 stocks are interchangable within guages...
The 12 GA and the 20 GA will fit on each other but the 12 GA is slightly wider that the 20GA, so there will be a slight overhang if you swap between guages...
it might overhang a bit, as Smitty said. If the stock is wood and you have any skill in woodworking, you could sand the stock to a better fit and finish.
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