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totally agree the information needs to be updated, the information I received from the arms office was direct from them when I spoke on the phone and that a permit was required for all firearms...

Permitfirearms@police.govt.nz

Yup POL67B form "application to import Firearms/restriced weapons/parts"

You can download the form then submit it via email, very easy.
I rang the local arms office in Christchurch and they were great to deal with.

I just replied to your facebook post with the same question.
Yes you need a permit, no it's not hard.
You just need to follow the process.
I have just been through this for some other parts.