This doesnt seem illegal at all. It is under the same provisions as an AR15 style pistol.
the capable of being concealed is the ATFs definition of AOW(Any other Weapon), which is a weapon that can be concealed, under 26 inches. This weapon is over 26 inches, not being concealable. Also not being considered a shotgun but a Pistol Grip Only Firearm, seems like a fun range gun, and sounds like a pretty good home defense gun.
With no cruiser rides involved.