Section 4 of the Principal Act is repealed and the following section is substituted:

4.     Possession of firearms

For the purposes of this Act –

(a) if a person knowingly has a firearm in the custody of another person, the first-mentioned person is still taken to possess the firearm; and

(b) if 2 or more persons possess parts of a firearm, each of them is taken to possess the firearm.