18 USC § 2332a(c)(2) and it's companion in the definition of "Weapon of Mass Destruction" of 18 USC § 921 defines a WMD firearm as: (3)The term “firearm” means

18 USC § 2332a(c)(2) and it's companion in the definition of "Weapon of Mass Destruction" of 18 USC § 921 defines a WMD firearm as: (3)The term “firearm” means (A) any weapon (including a starter gun) which will or is designed to or may readily be converted to expel a projectile by the action of an explosive; (B) the frame or receiver of any such weapon; (C) any firearm muffler or firearm silencer; or (D) any destructive device. This is basically any firearm. By this definition, any firearm not considered an antique is considered a weapon on mass destruction, which is clearly completely unworkable when considering allowing firearms for not just self-defense in the terms of attack but to the original reasoning of the second amendment which was to provide a check against a government ruling over its populace by force by allowing individuals to possess that same force.