comment: >
  
  
  This is a really good thing.
  
  It's a largely useless thing.  3D printing exists and will make perfectly serviceable receivers for guns.
context: This is a really good thing.
  I own guns and I built a Glock knockoff.  It's stupid easy, and all the parts for a functional gun were mailed to my house.  Took less than an hour to do it all.