I don't know about customs, but the ATF will regard the frame (lower) as being the firearm while all other parts are just parts. Was the frame sufficiently cut away to make it impossible to fire?
I would think that if the ATF says its a firearm, customs will go along with the argument.
Then, even if it does not constitute a legal firearm, it does not automatically follow that the particular customs agents involved know what they are talking about. They will want to cover their behind, and short of legal action, they are calling the shots.
Welcome to the world of red tape.
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