it's the seller's responsibility to check if the buyer is legally allowed to buy the gun or not depending on location. (applies to businesses and private sellers as far as I know) ASC's AV is more of a way to ensure that you are of age, since most games seem to be 18+, having a way to ensure that you get 18+ signups is pretty important. In the days of yore, it was the only way to find guns.
The classifieds here do have some reasonable deals, but resourceful people can find the multitude of brick and mortar stores to buy gns from these days.
btw, to get hooked up with the local community in ottawa, try www.ottawavalleyairsoft.com