3D Gun Blueprints taken down: "DEFCAD files are being removed from public access at the request of the US Department of Defense Trade Controls. Until further notice, the United States government claims control of the information."

So if you'd like to download it so that you will have it for later. Or if you want to download it and save it simply because they are saying you can't have it, here's the torrent where you can download it:

DefDist Defcad Liberator Printable Gun

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