I agree with lurkingknight, though. Your best bet is to sell your airsoft guns over there and just buy new or used ones over here. You'll be saving yourself a ton of head- and heartache trying to deal with CBSA to get them into the country.
Then, once you get over here, work on getting Age Verified right away. There are plenty of verifiers in the Toronto area, and as soon as you have that you get access to the classifieds here on these forums. You can often find a pretty good deal on whatever you're looking for, and usually at a nice discount from brand new.
Plus getting Age Verified will also allow us to share with you the list of Canadian airsoft retailers, in case you did want to go all brand new.