Clear bodied airsoft guns usually should not have an issue comming into Canada. That is not to say that some customs agent wont seize it simply because they can. Im sure you should have no issue importing a clear bodied pistol.
When it comes to taxes and fees, if they are applicable they would be handled by Canada post or whatever other company was choosen to deliver your item. So if Fedex delivered your item and there was 5 dollars outsanding due, you would simply pay Fedex.
"Its only a little bit on fire"