fook that, if I lived on 100 acres, I'd apply for a rural shooters licence (otherwise known as "Primary Production" - which means you can legally purchase and own military style, semi automatic assault rifles of up to .50cal (Primary Production - Either the owner, lessee or manager of land used for the business of Primary Production)
This means you could own a .223 (effectively a 5.56 NATO round) Civilian Purpose (Usually a factory semi auto) Steyr AUG, or an AR-15 or any number of other super cool guns that our over reactive government has otherwise labeled as illegal for most Australian citizens.
In NSW, you can specifically own a cat A, B or C rifle on this permit, with the cat C being the fun stuff - 10 round mag, self loading, centrefire.
It specifically does not allow "Rifles adapted for Military Purposes" - however, this doesn't stop you from owning the "De-Milled" civilian release models of these guns.
Essentially, they are the same weapon in every way shape and form, but they differ in being listed as a civie round spec rather than the NATO round, as mentioned above in relation to the Steyr. Also the Civie release Steyr is factory Semi Auto not full auto.
A mate of mine bought a big piece of land out west just so he could get this licence... bit of a gun nut hahaha
Gun City - Products - GUNCITY, GUN CITY, GUN SHOP, christchurch, rifle, shotgun, ... these are all examples of what would come under a NSW Cat C licence as described by the NSW Police firearms licencing site.
As you can see, there are some very "military" looking weapons there, but they do not breach the rules of Cat C, because they are purpose built, factory released as civilian release models of the well known military rifle, not an "adapted (modified) military rifle"