I have been stopped with a 14 inch single shot shotgun in the truck. After a lengthy
conversation about the finer points and details about "sawed off shotguns"and the legal barrel length vs overall length I was finally able to come up with the legal terms on the RCMP website concerning barrel vs overall length. Once verified that it was an official RCMP webpage my shotgun was measured and he politely admitted to being wrong.
If your worried my advice would be to save that page on the RCMP website to your phone to be brought up if needed.