It would get seized and you would have to fight like hell to get it back. The CBSA are supposed to use the FPS on the packaging as stated by the original manufacturer as a reference, regardless of BB weight. But the CBSA does not follow their own rules. Its all luck i suppose, maybe you would get an officer who knows what they are doing, Its possible at least.
Travis R. (aka Trapper)
Canadian Airsoft Marines. Field owner