These guys printed an AR lower receiver. It took them a couple of tries to design one that worked. Over here the lower reciever is the part considered the gun, but it isn't everything that is required for a functioning firearm. Other parts such as the bolt, bolt carrier and barrel probably couldn't be safely made using 3d printing.
http://www.youtube.com/watch?feature=pla...AW72Y_XPF4#!
http://www.youtube.com/watch?feature=pla...AW72Y_XPF4#!
Save a life. Adopt a greyhound.
![[Image: JUkLw58.gif]](https://i.imgur.com/JUkLw58.gif)