Did you ask has he sent to Australia before. This is about export laws of USA concerning firearms and parts. There was a story I read recently about a fellow who sent a stock- hunk of wood mind you-to Canada and received a subsequent visit from the Feds due to it being a gun part. As related it was not a pleasant experience and they walked away with a bit of his arse. The folks at Turnbull told me if it attaches to a gun it must go through an exporter. I suspect they do ship outside of the states and have probably done their due diligence.