From The Truth About Guns:

It’s been less than a month since new federal rules took effect attempting to rein in the proliferation of so-called “ghost guns,” a catchall term for unserialized, home-built firearms that Democratic leaders, law enforcement officials, and gun control groups say are turning up in the hands of criminals across the United States.

But barely a few weeks into the new regulatory regime, the firearms industry has already adapted and scored an early legal victory. And gun enthusiasts have created and released open-source blueprints for a simple plastic tool that offers a relatively quick, easy—and apparently legal—workaround for anyone who still wants to build an untraceable weapon.