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3D-printed full-auto bullpup 'ghost guns' can now be made for a couple of hundred dollars — designs have evolved dramatically outside the U.S.

The topic of 3D-printed "ghost guns" has always been one of the highest-caliber discussions worldwide — both in and out of the United States, where gun ownership is chambered in the Constitution.
The Conversation

3D‑printed ‘ghost guns’ are not as untraceable as criminals think – new study

The authors do not work for, consult, own shares in or receive funding from any company or organization that would benefit from this article, and have disclosed no relevant affiliations beyond their ...