You must have a current New Zealand firearms licence and any required endorsement and permit to legally possess most arms items or ammunition.
Arms items include firearms, magazines, parts, airguns, pistols, restricted weapons and pistol carbine conversion kits (PCCKs).
You do not need a firearms licence to possess an airgun if you are aged 18 or over, unless it is classified as a specially dangerous airgun.
The Arms Act 1983 explains the restrictions on possession of airguns.