Use of deadly means of harm

Every person who uses a sword, dagger, bayonet, firearm, poison or any explosive, corrosive, deadly or destructive means or instrument, shall– (a) if he does so with intent unlawfully to cause harm to a person, be liable to imprisonment for five years; (b) if he does so with intent unlawfully to wound or cause grievous harm to a person, be liable to imprisonment for ten years; or (c) if he does so with intent to maim or to cause dangerous harm to a person, be liable to imprisonment for twenty years.