Sites like DEFCAD or Odysee host the blueprints. Note that the State Department has previously fought to keep these files offline under export control laws (ITAR).
Under recent ATF rules, "frames and receivers" (the part of the gun that makes it a legal firearm) must be serialized if they are sold or distributed by a licensed dealer. buy 3d printed gun
This subject is a bit of a legal and ethical minefield, depending heavily on where you live. If you’re looking into this, here’s a breakdown of what the landscape actually looks like right now: 1. The Legal Reality Sites like DEFCAD or Odysee host the blueprints