according to this, realistics aep are prohibited firearm (correct dimension and finish)
http://www.rcmp-grc.gc.ca/cfp-pcaf/f...me_air-eng.htm
but one that would not look like realistic would not be consider a firearm
(so if you paint the airsoft pink it may or may not be consider a prohibited firearm at the discretion of the agent of the afsc who end up with it?)
and according to this
http://www.rcmp-grc.gc.ca/cfp-pcaf/f...porter-eng.htm
importing parts of prohibited firearm is prohibited.
so my guess was :
ok for battery and charger,
no for magazine (since they look like the real deal)
and a gearbox would be ''assessed on a case-by case basis''