US not-for-profit group Defense Distributed has published online 3D printer blueprints for a single-shot pistol called the Liberator; plans which have been downloaded 100,000 times in just two days, according to Forbes.
The group is hosting the files on Kim Dotcom’s controversial Mega file-sharing website.
The group has previously put online gun components like the body of an AR-15 and the magazine of an AK-47, but the Liberator has proven the most popular.
The Liberator has also surprisingly been most downloaded not in the US , but in Spain.
The project has already caused a legal backlash – with US congressmen calling for the renewal of the Undetectable Firearms Act, which would ban any gun unable to be detected by metal detector.
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