Attempting to restrict the distribution over the Internet of gun plans has been likened to the futility of preventing the widespread distribution of DeCSS which enabled DVD ripping.
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On December 3, 2013, the United States House of Representatives passed the bill To extend the Undetectable Firearms Act of 1988 for 10 years (H.R. 3626; 113th Congress).
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Under the Undetectable Firearms Act any firearm which cannot be detected by a metal detector is illegal to manufacture, so legal designs for firearms such as the Liberator require a metal plate to be inserted into the printed body.
Bureau of Alcohol, Tobacco, Firearms and Explosives | National Firearms Act | Printed circuit board | Authorised Firearms Officer | printed circuit board | Bushmaster Firearms International | Undetectable Firearms Act | Specialist Firearms Command | Receiver (firearms) | Marlin Firearms | Front Sight Firearms Training Institute | Third Volume of a 1727 edition of ''Plutarch's Lives'', printed by Jacob Tonson | The first book printed in France: ''Epistolae'' ("Letters"), by Gasparinus de Bergamo (Gasparino da Barzizza). The book was printed in 1470 by the press established by Johann Heynlin | Stock (firearms) | Printed electronics | Printed Circuit Board | Magazine (firearms) | Firearms unit | Earliest printed example of a classical T and O map (by Günther Zainer, Augsburg, 1472), illustrating the first page of chapter XIV of the ''Etymologiae | ''Burglars Tools Found in the Bank'', printed in 1875 in the Canadian Illustrated News | Bolt (firearms) | Benelli (firearms) |