A person may possess an air gun, which has kinetic energy in excess of one joule and in the case of :-
a pistol, not more than 8.13 joules (6 foot pounds); or
any other air gun, not more than 16.27 joules (12 foot pounds),
at a miniature rifle range, shooting gallery or a facility for combat games, providing the operator holds a firearm certificate for the air gun. In the case of combat games the exemption only applies to persons aged 16 years or more.