Hi Guys
Here in New Zealand which could be the same as Aus,possibly, you just go to your local cop shop and get the arms officer to write a letter to the commissioner of police saying your an OK sort of chap. The commissioner then sends you a letter which you send to those buggers at customs after they send you a letter saying they are holding a prohibited item which will be destroyed if you don't get a letter of approval within a certain time frame.

Pain in the arse. Pays to have all the paper work done well in advance.

Cheers

Ross