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A 3D printed gun can be a ghost gun, but a ghost gun is not inherently 3D printed (99%+ aren't)

That does not count. Those are all from parts kits. 3D printing of firearms outside of superficial accessories is a fraction of a fraction. And newsflash to the world -- Americans have been making "ghost guns" for hundreds of years. Hardly the worth the attention of Law Enforcement. Maybe focus on real crime and not propaganda tuned to scare the average burbanite.

Those are all 80% polymers.

Ghost Gun != 3D printed firearm