Sounds like the item, in this case a complete receiver, has to go to a FFL that has an import license and cannot be shipped directly to my FFL. Am I missunderstanding what you are saying?
The seller presented to me as only needing a Form 6, which he had and would fill out and send the form to me, then I would send it to Canadian authorities for approval, then he would get the form after aproval, attach it to the package and ship the item.
Is that not correct, or is a complete receiver treated differently than a complete firearm?