Liberator (gun)

The Liberator is a physible (3D-printable) single shot handgun, the first such printable firearm design made widely available online. The open source firm Defense Distributed designed the gun and released the plans on the Internet on May 6, 2013. The plans were downloaded over 100,000 times in the two days before the United States Department of State demanded that Defense Distributed retract the plans.
The plans for the gun remain hosted across the Internet and are available at file sharing websites like The Pirate Bay and GitHub.
On July 19, 2018 the United States Department of Justice reached a settlement with Defense Distributed, allowing the sale of plans for 3D-printed firearms online, beginning August 1, 2018.
On July 31, 2018 President of the United States Donald Trump posted on Twitter about the decision to allow the online publication of the Liberator's files: “I am looking into 3-D Plastic Guns being sold to the public. Already spoke to NRA, doesn’t seem to make much sense!”
On the same day the tweet was posted, a federal judge stopped the release of blueprints to make the Liberator due to it being an untraceable and undetectable 3D-printed plastic gun, citing safety concerns.
On April 27, 2021, the United States Court of Appeals for the Ninth Circuit vacated the injunction and ordered the district court to dismiss the case, holding that Congress had expressly prohibited judicial review of the agency decisions in question. 
Namesake and concept.
The pistol is named after the FP-45 Liberator, a single-shot pistol that George Hyde designed and that the Inland Manufacturing Division of the General Motors Corporation mass-produced for the United States Office of Strategic Services (OSS) in World War II. The OSS intended to air drop the gun into occupied Europe for resistance forces to use. A project of the OSS (which would later become the CIA), it is thought the Liberator was equally purposed as a tool of psychological warfare. Occupying forces in Europe would have to weigh evidence of distributed pistols as a factor in planning against civilian resistance, which would complicate their strategy and affect morale. However, though used in France, there is little proof that the pistols were ever dropped into occupied Europe in large quantities.
The physible Liberator's release to the Internet can be understood as Defense Distributed's attempt to more successfully execute the historical psychological operation, and as a symbolic act supporting resistance to world governments.
Withdrawal of plans and The Pirate Bay hosting.
Days after their publication, the United States Department of State's Office of Defense Trade Controls issued a letter to Defense Distributed demanding that it retract the Liberator plans from public availability. The State Department justified this demand by asserting the right to regulate the flow of technical data related to arms, and its role in enforcing the Arms Export Control Act of 1976.
However, soon thereafter the design appeared on The Pirate Bay (TPB), which publicly stated its defense of the information. Quoted on TorrentFreak: "TPB has for close to 10 years been operating without taking down one single torrent due to pressure from the outside. And it will never start doing that."
The site would go on to issue a statement on its Facebook page:
Reception.
Original copies of the Liberator have been permanently acquired by the Victoria and Albert Museum, and a copy of the gun is on display at London's Science Museum.
Writing in "The Register", Lewis Page ridiculed the Liberator, stating "it isn't any more a gun than any other very short piece of plastic pipe is a "gun"", and comparing it with a 1950s zip gun.
The television series How to Sell Drugs Online (Fast) depicts one of its protagonists printing and using a Liberator for self defense.
Usage history.
In May 2013, Finnish Yle TV2 current affairs programme "Ajankohtainen kakkonen" produced a Liberator handgun under the supervision of a licensed gunsmith and fired it under controlled conditions. During the experiment, the weapon shattered. It was later found that an error was made concerning the settings of the 3D printer. Printed under the right conditions, the Liberator gun has a lifespan of 8–10 shots.
Israeli Channel 10 reporters built and tested a Liberator with a 9 mm cartridge, successfully hitting a target at a distance of several meters. On June 24, 2013, the reporters smuggled the gun (without barrel and ammunition) into the Israeli house of parliament, coming within a short distance of Israeli PM Benjamin Netanyahu.
A Japanese man printed and assembled five copies of the Liberator, and on or about April 12, 2014, he uploaded video evidence of his possession of the weapons to the internet. Authorities arrested him on May 8, 2014, and found that at least two of the copies possessed lethal power. Cody Wilson, a founder of Defense Distributed, stated on the incident that the man "performed his work in the open, without suspicion, fear or dishonor".