[horsa]

ACS won't allow the barrels into the country even if you get police approval on the B709A/B forms.

Currently the other parts of the weapon can be imported permit free provided you break it up between boxes. Make sure that one box clears and is delivered prior to sending another if the two (or more) boxes of parts could produce a complete assembly. Be sure and pull all trigger parts from the lower butt slide and ship them separate from the lower since that completed assembly is restricted. Sounds weird but this is documented advice from an official with ACS. Basically parts to produce a restricted item don't in themselves constitute a restricted item. Restricted meaning you couldn't import it. You still must be legal to possess the items in parts or as a whole in your state and the laws vary from one to the other. Victoria is the most gun friendly though.

Magazines are the same way. Bodies need to go in one box and springs and followers in another.

No current way around the barrels though. I'm storing 15 MG34 barrels and 9 Bren barrels for a friend right now since they can't be imported currently and he is firearms licensed.

Overall there appear to be big changes in the works so if you are in OZ, you better get things while you can if they are originating in another country. The door is closing and historic collectible items will possibly be prohibited from entry soon.