You should really read up on the the endless forums of information contained here. This will help explain to you why not to import. Things like "Do not import yourself", "Your gun may be legal, but the CBSA doesn't have to allow it in, and probably won't", or the generally overlooked "your gun may not make it into the country, but your situation may get worse than that".
Read the forums and take advantage of the wealth of information here. Get yourself age verified as well, as ASC and members of, are limited to how they can help you unless you prove to be at least age of majority. Listen to the experienced people here, as we've all seen this before.
As far as your package goes, it's not looking good. If your Gun and mags were ordered at the same time, and the mags arrived without the gun, it means you probably won't get it. "Any" Airsoft gun, legal or not, "will" be checked at the border. If it contains a metal, or solidly colored receiver or frame, it has a 99.999999% chance of being seized. At which point you should receive a letter of seizure from the CBSA, when they get around to it. Once you receive this letter, you will have a chance to dispute the seizure. Which has a 99.999999% chance of being denied. Now your Airsoft gun will be destroyed. It "will not" get sent back to the retailer, and you "will not" be reimbursed for it in any way. Not to mention, if there is anything illegal about your Airsoft gun, you may even be facing charges.
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BC & YUKON MASTER AV REPRESENTITIVE