(1) A person must not, either intentionally or recklessly, deface or alter any number, letter or identification mark on any firearm or firearm part.Penalty: Fine not exceeding 100 penalty units or imprisonment for a term not exceeding 3 years, or both.(2) A person must not possess any firearm, or firearm part, on which any number, letter or identification mark has been defaced or altered.Penalty: Fine not exceeding 100 penalty units or imprisonment for a term not exceeding 3 years, or both.(3) If, at any time, a number, letter or identification mark on a firearm is defaced or altered, the firearm is (a) if it was registered at that time, automatically de-registered but may be re-registered if the Commissioner considers it appropriate; or(b) if it was not registered at that time, incapable of being registered.