I don't think so badboybeeson. I am not sure exactly how, but I do believe that with a dealers license they CAN import a prohib, replace the barrel and have the firearm status reassessed/approved as non-restricted, providing of course the original barrel is not supplied in the sale. I know of a few businesses that were doing this in the past, not sure what it entails, but there is no reason they cannot have the firearm reclassified with correct changes. Otherwise, tell me how I came in to possession of a non-restricted G19 from questar? I'd have to verify with Mark, but I am pretty sure that is the process considering I had two options to select from for a canadian length barrel. That said I have heard as Ryan reports from multiple sources, Glock does not want this to continue.
UPDATE - I was contacted by someone in the know and corrected. BBB, sounds like they are NOT allowed import without end user cert (ie; LEO/Mil) or something to that effect, so they are likely brought in to Canada with the barrel already installed (imported as restricted).