Yea that is because their illegal in Canada and are considered a prohibited and restricted weapon due to the fact that it is a replica MP5. The prohibited/restricted weapons list/booklet also goes on to talk about “Air Soft Guns” and states to be legal in Canada they must not be to scale (same size) and must be made of Clear Plastic so no one can mistake it for a real firearm and the list still continues from there.
So technically, or legally you should even be selling this or acknowledging the fact that you actually have it because the cops will treat it as if its a real gun simply due to the fact that it breaks the law and is classified as a prohibited/restricted weapon.