CBSA ultimately has the final say in what can be imported... they can stop a perfectly legal item if they wanted to. Of course it can always be protested. But even regular stuff is never guaranteed, never mind things that are grey market items.
Sometimes it isn't worth the trouble for a commonly found item, but for a big enough price difference it could be worth a chance big or small, with the paperwork.
Any resourceful person with google skill can find most of the brick and mortar airsoft vendors in canada, and some of the online only ones... the lack of AV on here just means people here won't help you find the gun for cheaper. I would keep shopping, personally. You don't have to have it waiting for you when you get off the plane so to speak.
I futz with V2s, V3s and V6s. I could be wrong... but probably, most likely not, as far as I know.