I'm finding researching the circa-late 30s to early 40s Savage 420/430 series of over/under shotguns to be a tough job, but one thing I think I've found to be true is that the receivers were all the same size regardless of the gauge. If this is the case, then could you fit a set of 20-gauge barrels to a 12-gauge frame to make a switch barrel scatter gun? Thanks much and I appreciate all input.
