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While Defense Distributed sees its guns as a way for people to defend themselves, at least one U.S. lawmaker wants the weapons to be made illegal.

Sen. Charles Schumer claims the plastic design would make the weapons undetectable by airport scanners.

“Guns are made out of plastic, so they would not be detectable by a metal detector at any airport or sporting event,” Schumer told reporters. “Only metal part of the gun is the little firing pin and that is too small to be detected by metal detectors, for instance, when you go through an airport.”

“A terrorist, someone who’s mentally ill, a spousal abuser, a felon can essentially open a gun factory in their garage,” Schumer added.

The weapon can fire a .380 handgun round, but Forbes, which was on hand for the firing, claimed a larger 5.7×28 rifle cartridge was tested, and blew apart The Liberator.

3D printing technology is seen as one future direction for manufacturing. Typically, it takes a digital representation of an object, and recreates it physically by laying down thin layers of material, usually plastics, until the digital file is literally printed in three dimensions.

The object could be an iPhone case, a simple tool, a high-capacity magazine, or if Defense Distributed has its way, all the parts for a single-use firearm. The notion behind 3D printing is that as sophisticated printers become more affordable, consumers can download designs at home for the goods they might otherwise purchase, and “manufacture” these goods themselves.