So, just to be clear; an unaltered magazine body without parts is only illegal when you try to import it? As an unassembled magazine body already in Canada without a rivet, indent or other body attached blocking device, that is legal?

Wasn't there case law on this already? I do believe there was a guy trying to import bodies by themselves to be pinned in Canada. He was charged, and convicted. What is to stop someone from being charged with an unassembled magazine body that hasn't been modified to limit to 5 because a baseplate block is being used?