Except for the barrel most/all the metal parts of a modern auto- or semi-automatic firearm can be manufactured using a combination of 3D printed plastic parts, "loss wax" molding from the plastic parts and heat treatment or ball shot hardening of the molded metal parts.
For spreading illegal information.
https://defcad.com/bluewall/
https://web.archive.org/web/20180829021147/https://defcad.com/bluewall/
transcript:
"451
Oops. You're behind the Blue Wall
Your masters say you can’t be trusted with this information.
Sorry, little lamb."
Is a funny page of what users in 20 states and the majority of the world are presented with when trying to get the DEFCAD files.
What is funny though, is that I will openly distribute all of the defcad files to everyone regardless of law. I am not
afraid of any court order or any enforcement attempt. And to any prosecutors or judges, your efforts are a waste.
I am a criminal. My crime, exercising my freedom of speech and taking a stand against censorship.
Thousands of people will upload these files into the public domain.
Information cannot be stopped. I am calling on everyone whom ordered these files to upload them into the public domain and
compare the hashes with each other for decentralized distributed integrity verification.