A growing online gun rights movement known as "3D2A," and the accessibility of 3D printers, have sparked an explosive growth of ghost guns in New York City — and could soon spread across the nation, the New York City Police Department said.

Ghost guns are mostly assembled from kits composed of separate parts ordered online, with no registration information, making them practically untraceable. But over the last year, engineers and hobbyists have upped the ante, and law enforcement has seen an increase in the use of 3D printers to create almost every part of the weapon. The plans are readily available online, with engineers competing with each other to both make ever better designs and to circumvent emerging legislation designed to crack down on ghost guns.

"We see the speed and tens

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