3-D printers are used for all types of applications. One company put the plans up on the internet for anyone to download. These guns are un detected by metal detectors because they are made of plastic. The USA requires a piece of metal is put in them so they can be detected.
These printers can be bought by anyone and could pose a problem for putting guns on the street that can not be traced. There are a lot of questions about regulating these firearms and how it will be done. Watch the video below to see one in action.
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