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I might order 10, 000 stock screws. And fill out a form for each of them...

Looking further into this, the Arms (Prohibited Firearms, Magazines, and Parts) Amendment Act 2019 ammends the Arms Act 1983.

And where normally Acts come into force 12 months after being...

Not quite correct.


Emphasis mine.
LEGALLY only the action needs a permit, unless it's a pistol, mssa or restricted airgun.

Not to say Police don't arbitrarily make their own interpretations...