You do not have the right to own a firearm in Australia regardless of whatever mental gymnastics you want to perform.
- The fact that a forcible confiscation (governments cannot "buy back" something they never owned) campaign could happen at all means you do not have this right. "Give us these items or go to prison or die when we come to take them" - some right you have there!
- If you cannot own remotely the same articles that your police do, you do not have a right to bear arms. You have a privilege to own a limited set of items under a limited set of circumstances - all of which would be useless for mounting violent resistance.