DIY rifles are untraceable and completely legal
keyetv.com
keyetv.com
But you don't even to buy such an "80% lower receiver" to do this -- you can just make your own lower receiver out of most anything (it need not stand firearm chamber pressures, unlike the bolt carrier / bolt and barrel, which are much harder to DIY), up to and including wood.
Murders done with rifles are quite rare (an overwhelming majority of murder is done with handguns, per FBI's Uniform Crime Report) so the disproportionate focus on the evils of such "ghost guns" / "DIY rifles" is baffling.
Making the barrel the serial numbered and tracked portion of a gun would make it much more difficult to machine at home.
Then they could just leave the 3d printer industry alone.
This seems like a problem which can't be regulated away without severely impacting other industries (ie preventing production 3d printing machines which could produce these firearms).
Even with plans being illegal, it seems that where there is a will, there will be a way, even if it's through a black market or trial and error.
If that's the case does regulation make sense? Is there a more viable alternative?
Rifles are on the order of 20% as likely to be used to commit a murder as knives ( https://ucr.fbi.gov/crime-in-the-u.s/2013/crime-in-the-u.s.-... ).
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Regulating what people can build in their own homes is not a good idea, nor is saying "this set of machine blueprints is legal to possess, while this other is not". The hacking community has known this for a long time ( https://www.gnu.org/philosophy/right-to-read.html ).
Does the militia clause limit the right of ordinary American citizens to own firearms? Is every citizen a potential militia member?
http://www.newyorker.com/news/daily-comment/so-you-think-you...
No. This is a question of basic English grammar - to read it any other way one has to be trying to confirm their agenda.
> Is every citizen a potential militia member?
Yes. I could go out an join a militia today if I so desired. So could you.