Comment by cjhveal

It's definitely not 100% unregulated to produce your own firearm in the United States. It can be very very illegal to do so and it's a really dangerous piece of advice to be giving a bunch of hackers. You must obey state and municipal laws regarding your eligibility to own a firearm at all. The firearm itself must be legal according to your state law. In the entire country, you must apply to the DOJ for a serial number before completion of the firearm and you must have it permanently engraved or imprinted upon the receiver or a piece of embedded steel.