Thats what 40 years of liberal social engineering gets you. No one will ever go to jail over possession of an inanimate piece of aluminum, even if its a 100% receiver. There would have to be some other act of criminality in the story for you to get a custodial sentence, and even then thats a 1:1000 odds against scenario.
This is confusing. You most certainly can make a prohibited device. Just unpin a magazine. Surprisingly, while the act of manufacturing a prohibited device without authority is illegal, modifying a lawful device to become a prohibited device is not. Converting a firearm to a full auto is a criminal offence separate from possession of the full auto, but the same does not appear to be true for prohib devices. Manufacturing a prohibited magazine would be illegal, but converting a legal magazine to a prohibited device does not appear to be an offence.
The weird thing about this 80% nonsense is that you start with a legal item, a block of aluminum, and at some point you pass through the 80% stage and are in possession of prohibited device which is unlawful to make, and if you keep going to 100% you have made a firearm receiver which is deemed restricted and lawful to own. If you stop to pee, eat a sandwich, answer the phone or check the time while passing through that 80% stage you are a criminal. While that 80% item is prohibited and illegal to own because of the risk it poses to the public, it is practically useless. But if you finish it into a receiver and then a firearm that shoots actual bullets capable of killing humans, its considered safe and legal to own. Thats literally how stupid the RCMP are and how stupid the government is that supports them. But bad laws can only possibly result in bad interpretations.
What the police and crown do is they arrest and charge, and then offer to drop all charges if you voluntarily forfeit the item. Every defense lawyer on earth will beg you to take that deal. The item is never worth the cost of defending the charges, and this is why years later the issue has still never been in front of a judge.