Well i would like to say you here about mu Gun .. When i buy my Gun the firsts step which i attempted is to register my Gun in a legal way by the gvt of Australia & get the licence of my gun with the help of a Lawyer.
My Good Luck that this lawyer was my friend's friend otherwise you may face some difficulties to Hire a Lawyer and get the licence for your gun. But this is necessary to make your Gun's licence in a legal way.
Take Care .. :-)