For this regulation, a firearm part that is a barrel is taken to be a "spare barrel" if—
(a) if the person in possession of the barrel is a person other than a firearms dealer—the person possesses a firearm that can be used with the barrel; or
(b) if the person in possession of the barrel is a firearms dealer—
(i) the dealer intends to sell the barrel with a firearm to another person; or
(ii) the dealer intends to sell the barrel to a person who has a firearm that can be used with the barrel.