I know this is a RIFLE forum, but since Maynards often seem to have come with auxiliary shotgun barrels or had them added, does anybody know if they were made for conventional shotgun shells as well as the custom chambers (like MP's Neidner .38-55) and proprietary Maynard shells?

I've only seen them with Maynard proprietary "everlasting" shot shells, never chambered for regular paper, say 12 or 16 guage, shells.