As used in this part, the term:
(1) Dangerous weapon means any weapon commonly known as a rocket launcher, bazooka, or recoil- less rifle which fires explosive or nonexplosive rockets designed to injure or kill personnel or destroy heavy armor, or similar weapon used for such purpose. The term shall also mean a weapon commonly known as a mortar which fires high explosive from a metallic cylinder and which is commonly used by the armed forces as an antipersonnel weapon or similar weapon used for such purpose. The term shall also mean a weapon commonly known as a hand grenade or other similar weapon which is designed to explode and injure personnel or similar weapon used for such purpose.
(2) Machine gun means any weapon which shoots or is designed to shoot, automatically, more than six shots, without manual reloading, by a single function of the trigger.
(3) Person means any individual, partnership, company, association, or corporation.
(4) Sawed-off rifle means a weapon designed or redesigned, made or remade, and intended to be fired from the shoulder; and designed or redesigned, made or remade, to use the energy of the explosive in a fixed metallic cartridge to fire only a single projectile through a rifle bore for each single pull of the trigger; and which has a barrel or barrels of less than 16 inches in length or has an overall length of less than 26 inches.
(5) Sawed-off shotgun means a shotgun or any weapon made from a shotgun whether by alteration, modification, or otherwise having one or more barrels less than 18 inches in length or if such weapon as modified has an overall length of less than 26 inches.
(6) Shotgun means a weapon designed or redesigned, made or remade, and intended to be fired from the shoulder; and designed or redesigned, and made or remade, to use the energy of the explosive 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.
(7) Silencer means any device for silencing or diminishing the report of any portable weapon such as a rifle, carbine, pistol, revolver, machine gun, shotgun, fowling piece, or other device from which a shot, bullet, or projectile may be discharged by an explosive.