California could become the first US state to ban 3D-printed guns after a politician said he would introduce a proposed law against the devices.
Leland Yee, a Democratic state senator, announced his plan to outlaw the technology which experts have warned could make gun regulation virtually impossible.
"We must be proactive in seeking solutions to this new threat rather than wait for the inevitable tragedies this will make possible," he said. "While I am as impressed as anyone with 3D printing technology, and I believe it has amazing possibilities, we must ensure that it is not used for the wrong purpose with potentially deadly consequences."
A spokesman for Yee said a bill to prohibit 3D-printed guns was being drafted.
The plastic handgun, the Liberator, was invented by a group in Texas called Defence Distributed, and can be made using a home computer and a US$1000 ($1180) 3D printer that uses heated plastics.