check with the MI State Police. MI appears to follow the Federal law, which requires a barrel length of at least 18 inches, and overall length of at least 26 inches.
From Michigan State Code, Firearms, Definitions:
(i) "Short-barreled shotgun" means a shotgun having 1 or more barrels less than 18 inches in length or a weapon made from a shotgun, whether by alteration, modification, or otherwise, if the weapon as modified has an overall length of less than 26 inches.
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