Tools of Modern Gunmaking: Plastic and a 3-D Printer

“Inexpensive 3-D printers have grown in popularity in part because they are easy to use. It is not even necessary to know how to create the design files that instruct the device to print bit after bit of plastic to build the object, as there are files for tens of thousands of objects available on the Internet, created by other users and freely shared.  A lower receiver is the only part of an AR-15 that, when bought, requires the filing of federal paperwork. But it is legal to make an AR-15 for personal use as long as there is no intent to sell them. And if the lower receiver is homemade, no paperwork is required.”

http://www.nytimes.com/2013/01/30/science/surprising-tools-of-modern-gunmaking-plastic-and-a-3-d-printer.html?_r=2&&pagewanted=all

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