Israel's bill, meanwhile, has gone nowhere, leaving a widening gap between DIY weapons and the law.
But the representative from New York says he hasn't given up: In the next few months, Israel's office tells WIRED he plans to reintroduce legislation that would ban 3-D printed guns or any other fully-plastic firearm. The Undetectable Firearms Modernization Act, which Israel first tried and failed to pass last year, forbids the possession or manufacture of any gun that could slip through a standard metal detector unnoticed, including those that include a removable chunk of non-functional metal—what he sees as a loophole in the current law against plastic weapons.
"My legislation is about making sure that we have laws in place to ensure that criminals and terrorists can't produce guns that can easily be made undetectable. Security checkpoints will do little good if criminals can produce plastic firearms and bring those firearms through metal detectors into secure areas like airports or courthouses," Israel wrote in a statement to WIRED. "When I started talking about the issue of completely plastic firearms, I was told the idea of a plastic gun is science-fiction. That science-fiction is now a dangerous reality."