Fostech has a new Origin 12 firearm for 2017. It has a short barrel and is semi-automatic but is not classified as a SBS or SBR. Gun laws are so strange. But anyway, since this weapon is not shouldered like a normal shotgun or rifle, it is not classified as a short barrel shotgun nor short barrel rifle. So you can buy a Fostech Origin 12 SBV like any standard firearm. They make exceptional self-defense or special ops weapons. The Origin 12 SBV retails for $2750
Check out this review on the Fostech Origin 12 SBV.