(1) Definition. In ss. 941.25 and 941.26, "machine gun" means any of the following:
(a) Any weapon that shoots, is designed to shoot or can be readily restored to shoot, automatically more than one shot, without manual reloading, by a single function of the trigger.
(b) The frame or receiver of any weapon described under par. (a) or any part designed and intended solely and exclusively, or combination of parts designed and intended, for use in converting a weapon into a weapon described under par. (a).
(c) Any combination of parts from which a weapon described under par. (a) can be assembled if those parts are in the possession or under the control of a person.
(2) Exceptions.Sections 941.25 and 941.26 shall not prohibit or interfere with the manufacture for, and sale of, machine guns to the military forces or the peace officers of the United States or of any political subdivision thereof, or the transportation required for that purpose; the possession of a machine gun for scientific purpose, or the possession of a machine gun not usable as a weapon and possessed as a curiosity, ornament or keepsake; or the possession of a machine gun other than one adapted to use pistol cartridges for a purpose manifestly not aggressive or offensive.