(NEWSER– After months of creating plastic guns with 3D printers, ATF agents have confirmed that they work—a lot of the time—and can be both lethal and very hard to detect. "We downloaded files, we created firearms from those files, and we tested those firearms," said the chief of the agency's firearms technology branch after experiments with the Liberator, a plastic handgun that can be printed with blueprints posted online that were downloaded more than 100,000 times earlier this year. To comply with the soon-to-expire Undetectable Firearms Act, the Liberator design includes a few ounces of metal, but it can be removed and the weapon works perfectly without it, theHuffington Post reports.

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