![An ATF agent holds a generic unfinished receiver, back, and one that has been machined, front, at an ATF field office, on May, 06, 2014 in Washington, DC. Unfinished receivers can be turned into working automatic weapons that are untraceable. (Photo by Bill O'Leary/The Washington Post)](https://pix.avax.news/avaxnews/bd/60/000160bd_medium.jpeg)
An unknown number of guns are being built with the mechanisms, causing problems for the police and ATF officials. Photo: An ATF agent holds a generic unfinished receiver, back, and one that has been manufactured, front, at an ATF field office in Washington, on May 06, 2014. The ATF is trying to crack down on the trade in the makeshift guns by targeting shops and individuals who offer to turn the unfinished receivers into functional pieces for firearms. (Photo by Bill O'Leary/The Washington Post)
19 May 2014 09:22:00,post received
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