"Category A" is your bog standard arms license. It permits ownership of bolt, lever and similar action rifles and shotguns, and some semi-autos. ...
What defines "Military-Syle" is not actual functionality, nor is it actual use by militaries -- it is literally a matter of style.
stuff.co.nz/timaru-herald/…
And the Police info page:
police.govt.nz/about-us/publi…
And the judgement: forms.justice.govt.nz/search/Documen…