Holt's auction house in the UK may be able to arrange pick up from various European locations and freight of a firearm to Australia. They have one or two Australian agents who can then take import delivery.

David Handyside in SA is one Holt's agent. I can pass on contact details if PMed.

Obviously for a fee, export costs, import costs etc. Discuss the possibility with the agent. Firearms might be shipped with a regular auctioned lot.

I have utilised David's services in the past.