5.—(1) Nothing in section 10 of the Principal Act shall make it unlawful for a person to sell a part of a firearm, being a replacement, spare or extra part for use solely as part of such firearm, to a person (in this section referred to as the purchaser) who is the holder of a firearm certificate in respect of such firearm or who is entitled by virtue of the Firearms Acts, 1925 to 1971, to have possession of such firearm without having a firearm certificate therefor and no separate authorisation shall be required for the possession and carriage of such part by the purchaser.

(2) In this section “sell” has the meaning assigned to it by section 10 of the Principal Act.