VintovkaMosin
Member.
I saw this somewhere and I wondered: An O/U shotgun, in teh middle position fires both barrels, on a single trigger pull. Is it a machine gun? I think not, because a machine gun fires one round at a time, and by extension, a "market gun" with one trigger and more than one barrel is also an MG, and those are legal AFAIK? What do the NFA experts rule?