If you are planning on staying in Canada it is fine to travel around with your airsoft as long as you declare it and have it safely stored. But the import laws will NOT let you back into Canada with your airsoft. Do not try and hide it from the customs workers, it is a recipe for trouble. While coming to Kingston from Vancouver with a KJW M9 I ran into troubles because I didn't declare it. Everything was fine but I was scared as hell.
When you start bringing guns in and out of the country you are playing with fire. Just don't do it.
Kingston airsoft, we do it better.