Has anyone known anyone to get a constructive possession charge for ridiculous situations as outlined in this thread? I'm not talking about a friend of a friend through the grapevine rumour. I am talking about actually know the person (so it's not rumour). Or is there proof in news or court cases where this happens? The closest thing I've found is not locking up guns when a felon is in the house, addon's to violent crimes like in gang violence and then some dude that sold a gun with accessories that clearly made it illegal. Those are some VERY clear cut situations.
From my understanding, it's not some specially tailored law where the govt automatically portray your intent for having some no no parts. It's just using the basic "constructive possession" idea in general law, where there is no direct evidence of you possessing something but rather the prosecutor has to construct your possession. That's on them to actually convince a jury that the only reason you could reasonably have this item is so you possess something illegal for you to possess.
Example: Having multiple short barrelled uppers isn't illegal , as long as you have one SBR lower. Just because they COULD be put on a non registered SBR, doesn't mean it's constructive possession. No more so than them nailing you for constructive possession because you have the ability to easily take the upper off your SBR and put it on your Non-sbr. Whats stopping you from constructing a illegal SBR there? An extra 10 seconds it takes to take the upper off your SBR?
On the other hand, if you have only non-registered lowers and a bunch of short barrelled uppers... It's much more clear what is going on.
Having a m16 lower parts group, when you have an m16 going through the system and none of your ar15's have a 3rd hole, shouldn't give you any trouble. Why would it? Show me one person where it has. It's clear why you have it and it is for legal purposes.
On the other hand, do you have an m16 lower parts group and a spare ar15 lower that you drilled a 3rd hole into? Well it's not illegal to own the m16 parts kit and it's not illegal to drill holes in guns.... But it's pretty clear what is going on here and this is where the prosecutor will have an easier time to construct your possession of an illegal MG.
Last point to address is this idea of "well they can charge you with it ignorantly and then it's on you to fight in the courts. Who wants to deal with that"...... I mean sure.... But you can literally say that about anything since they can charge you with anything at any time for any reason. You think the officer that wants to make your life hell can't take away your MG and charge you with owning an illegal machine gun regardless of you showing your paperwork? All he has to claim is he didn't know about that paperwork or he couldn't verify it's authenticity. You're back in courts sorting it out and he's got qualified immunity so it's not skin off his back. Moral of story? They can already get you for something if they want to. Try not to give them a reason to and if you do, you have to fight it. We shouldn't have to hide under a rock in fear of our rights being taken away just out of expedience. They may as well be taken away then.
I am not a lawyer, and this is just from everything I have gathered from tons of threads and attorney websites. I would love for someone to give any evidence that proves my ides on the issue wrong though!