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Re:3D printers have ‘fingerprints,’ which could help trace g... by anilakar on Saturday October 20, 2018 @04:30PM (#18265262)
>the lower receiver is the "gun" portion that is serialized.

AFAIK this a problem only under American legislation where the firearm is legally defined by one part, which in AR-15's case happens to be that lower receiver. Here a permit is required for the receiver, barrel, bolt, carrier and all other "substantial" parts, and our gun legislation is relatively lax in comparison to other EU countries.

Re:3D printers have ‘fingerprints,’ which could help trace g... by Rebelgecko on Saturday October 20, 2018 @05:57PM (#18265711)
I'm not European, but from my understanding that's not consistent throughout the EU. In Germany, you can buy receivers—even full-auto ones— over the counter without any sort of license or permit.
Re:3D printers have ‘fingerprints,’ which could help trace g... by webster23 on Saturday October 20, 2018 @06:22PM (#18265803)
Try buying a barrel for an AR-15 in Germany, you'll have to show a WBK (Waffenbesitzkarte).