Okay, this is about the 3rd time I have heard that someone had passed the border from US to Canada with Airsoft Guns no problems. Two of them having to CONFIRM first that they are allowed to do so. One of my friend even had brought a CYMA MP5J through the airport all the way from the Great wall of China.
This really tells you something.
By this time, it's really something to look into now. I feel that many people here are very "Against" the fact like these and they try not to believe it because they don't want to think that they payed Extra $$ buying these in Canada.
I'm trying to investigate this myself. Emailing about this to the customs, they only gave me the link to their site where it says that Airsoft guns are not allowed to be imported which is 5 years old.