15.—Any person who after the passing of this Act has in his possession or under his control any firearms or ammunition—

( a ) with intent to endanger life or cause serious injury to property, or

( b ) with intent to enable any other person by means of such firearm or ammunition to endanger life or cause serious injury to property,

shall, whether any injury to person or property has or has not been caused thereby, be guilty of felony, and on conviction thereof shall be liable to suffer penal servitude for a term not exceeding twenty years, or imprisonment with or without hard labour for a term not exceeding two years, and the firearm or ammunition aforesaid shall be forfeited.