[ToRN]

The problem with what you said is not the legality of airsoft, it is the problems that come from hiding anything from a customs agent, as well as the fact that you told someone on a public forum to conceal the existence of the gun by hiding it at the back of the truck, thus making you look like you are doing something wrong, so you will be treated as such.

As well as the fact that according to Customs Canada, you cannot transport airsoft accross the border, and you are telling someone to go ahead and do it anyway, which could mean a whole lot of trouble for them if it were found, and they were trying to hide it/didn't declare it.