After Sako and Tikka were bought by Beretta, the rights to the 412/512 were sold to Marocchi. I don't know if they still produce them. I believe barrels were largely interchangeable between the Marocchi version and the earlier models. I think Centreway Firearms in Keilor East used to be the Australian agent. Maybe give them a call as to status and whether they have any barrel sets still in stock.