Well here is what I know about it.
You might be right, Although It could depend on how the CPA action is marked, Mine don't say USA. Ambler PA or Dingmans Ferry PA is the mark, as a general rule US goods exported get a customs form before they leave the county, coming back they walk right in no paperwork at all no matter how they are marked.
My German made Anschutz 54 formerly owned by the Manly NSW Small Bore Rifle Club had to be imported by a licensed US Importer and receiver marked with his name. No duty at all, only the importers fee for handling the transaction and stamping the action. 100 dollars I think it was, Neal Johnsons Gunsmithing who at the time was the official Anschutz Importer, Neil's business is closed now so he's not a option
I also had to get a Export permit from the Australian Government, which was simple and inexpensive all done through the mail. I paid no freight put it on our company's ship care of the Captain in his bonded stores locker, declared on the Customs manifest on arrival in the US as personal effects. Air freight if I was to guess would be a couple hundred dollars
I told you my dealer was inexpensive, turns out he is in quantity not for individual guns, 500 for 5 guns 30 dollars a gun after. Here is a link to his site which has a lot of detail on the requirements
Fact that your gun is returned US Goods could well make it much easier. I have been through a dozen Customs inspections with American Firearms all on a US Customs form 4455 with no difficulty, link to that site too.
For a definitive answer best go to a experienced importer who will consult his Customs House Broker. And be aware they are like Tax prep companies, give advice it's still your bond that has to be filed & the entry is posted against. Customs has some set times to process the entry's letting your shipment go and notify you the bond is released or additional duty is due. It's "Liquidated" allowing you to have the bonding company release your obligation
(You need to Login or Register to view media files and links) (You need to Login or Register to view media files and links) Lot of BS but every thing in a Wal Mart store goes through the same process. And look how cheap they sell.
Boats