Commonly available does not mean the same thing as common. If there were any smg pistols in country, even one, it would be commonly available for any one with a licence to possess it. The lab has said so publicly.
And therein lies the problem. Even before Rock banned .32 cal. pistols in C-68, that old hag Campbell had already banned by name and had confiscated (without compensation) any Skorpion pistols in private hands in Bill C-17 back in '92. So there is not even one single Skorpion pistol in private hands in this country to set a precedent for availability.