That's one idea. Since the long gun registry went down, there is no record of private long gun sales or trades for anything not restricted or prohibited. They would have a hard time proving you owned any of them. Any gun bought new, will be registered at the store. Do I still have that gun? No Sir, sold it to a stranger that had a valid PAL. No Sir, I don't recall his name. We learned what happened the last time they asked us to register them. Even after being ordered to destroy the registry, they somehow managed to target law abiding gun owners in High River during the flood. They still have not explained how they knew what house had firearms and which didn't. Even worse, they roped a gullible Canadian Armed Forces into helping them go around breaking into houses and stealing personal property. Once they had private property in possession, they were atrocious in the handling of said property. Some owners received them back rusted, scratched, dinged and broken.
If they try again I believe the non compliance will skyrocket from what it currently is, or was. They've shown they can't be trusted when it comes to private gun ownership.
IF they try anything with ARs and variants, remember, only the serialized portion of the receiver is accountable. On most ARs it's on the mag housing. IF they need to be turned in, strip the whole receiver of all it's parts, springs, pins whatever. Take a hammer to the remainder and send them the part with the number on it. That is all that's registered and required to be surrendered. The rest of the gun is just parts. Barrels, trigger groups, plastic and rails can all be used on other firearms that ARE NOT AR's or variants. Those belong to you. I will do the same to all mine if they have to go to government storage. They will not get an operating firearm from me. My undamaged completely stripped receivers are what will be on their shelf. An AR can be completely assembled from scratch, every single part, in a little more than an hour. So setting it back up to shoot is not any kind of chore.