Wisconsin statute.
941.28Possession of short-barreled shotgun or short-barreled rifle.
(1) In this section:
(a) "Rifle" means a firearm designed or redesigned, made or remade, and intended to be fired from the shoulder or hip and designed or redesigned and made or remade to use the energy of a propellant in a metallic cartridge to fire through a rifled barrel a single projectile for each pull of the trigger.
(b) "Short-barreled rifle" means a rifle having one or more barrels having a length of less than 16 inches measured from closed breech or bolt face to muzzle or a rifle having an overall length of less than 26 inches.
(c) "Short-barreled shotgun" means a shotgun having one or more barrels having a length of less than 18 inches measured from closed breech or bolt face to muzzle or a shotgun having an overall length of less than 26 inches.
(d) "Shotgun" means a weapon designed or redesigned, made or remade, and intended to be fired from the shoulder or hip and designed or redesigned and made or remade to use the energy of a propellant in a fixed shotgun shell to fire through a smooth bore either a number of ball shot or a single projectile for each single pull of the trigger.
(2) No person may sell or offer to sell, transport, purchase, possess or go armed with a short-barreled shotgun or short-barreled rifle.