Some examples of the types of firearms that must be registered are:
The frames or receivers of machine guns;
Any combination of parts designed and intended for use in converting weapons into machine guns;
Any part designed and intended solely and exclusively for converting a weapon into a machine gun;
Any combination of parts from which a machine gun can be assembled if the parts are in the possession or under the control of a person;
Silencers and any part designed and intended for fabricating a silencer;
Destructive devices; and,
"Any other weapon."
A few examples of destructive devices are:
Anti-tank guns (over caliber .50);
A few examples of "any other weapon" are:
Ithaca Auto-Burglar guns;
Cane guns; and,
Gadget-type firearms and "pen" guns which fire a projectile by the action of an explosive.