Destructive device means (i) any explosive, incendiary, or poison gas, bomb, grenade, rocket having a propellant charge of more than four ounces, missile having an explosive or incendiary charge of more than one-quarter ounce, mine, or other similar device; (ii) any weapon, except a shotgun or a shotgun shell generally recognized as particularly suitable for sporting purposes, by whatever name known that will, or may be readily converted to, expel a projectile by the action of an explosive or other propellant, and that has any barrel with a bore of more than one-half inch in diameter that is homemade or was not made by a duly licensed weapon manufacturer, any fully automatic firearm, any sawed-off shotgun or sawed-off rifle as defined in § 18.2-299 or any firearm prohibited from civilian ownership by federal law; and (iii) any combination of parts either designed or intended for use in converting any device into any destructive device described in this subsection and from which a destructive device may be readily assembled. "Destructive device" does not include any device that is not designed or redesigned for use as a weapon, or any device originally designed for use as a weapon and that is redesigned for use as a signaling, pyrotechnic, line-throwing, safety, or other similar device, nor shall it include any antique firearm as defined in subsection G of § 18.2-308.2:2.