From Matt Lubchanski for The Nib: https://thenib.com/print-is-death
Some addenda & caveats I would like to add as disclosure:
- Yes I know that arguably printing 3D-printed guns have always been technically legal in the USA in some form.
- Yes I know gun rights issues are not simple.
- Yes I know most AR-15 owners are not hot-blooded potential terrorists.