Quoted:IANAL
I don't believe that is a correct reading of the statute. A non-rifle firearm that is over 26" would not be a pistol, just a "firearm." Even if MI said it was a MI-SBR - subsection(3) would nullify it as the firearm is lawfully possessed under Federal law.
750.222 Definitions.Sec. 222.
As used in this chapter:
(e) "Firearm" means any weapon which will, is designed to, or may readily be converted to expel a projectile by action of an explosive.
(f) "Pistol" means a loaded or unloaded firearm that is
26 inches or less in length, or a loaded or unloaded firearm that by its construction and appearance conceals itself as a firearm.
(i) "Rifle" means a firearm designed or redesigned, made or remade, and
intended to be fired from the shoulder and designed or redesigned and made or remade to use the energy of the explosive in a fixed metallic cartridge to fire only a single projectile through a rifled bore for each single pull of the trigger.
(k) "Short-barreled rifle"
means a rifle having 1 or more barrels less than 16 inches in length or a weapon made from a rifle, whether by alteration, modification, or otherwise, if the weapon as modified has an
overall length of less than 26 inches.
750.224b Short-barreled shotgun or rifle...Sec. 224b.
(1) A person shall not make, manufacture, transfer, or possess a short-barreled shotgun or a short-barreled rifle.
(3) Subsection (1) does not apply to a short-barreled shotgun or short-barreled rifle that is
lawfully made, manufactured, transferred, or
possessed under federal law.