Kokanee is correct in both cases.
ITAR is administered by the State Department and is similar to our Controlled Goods Program.
Customs and Border Protection (the patrol?) has no interest or mandate in controlling goods coming into Canada and CBSA in Canada has no interest or mandate in enforcing ITAR.
The only thing any airsofter has to worry about regarding ITAR is that an American retailer will do its due diligence and not ship the item to Canada (or in some cases a UPS store where it's evident that the item will end up in Canada).
Views are my own.