"In the United States, it's now illegal to own or make a wholly plastic gun of any kind, including those made on a 3D printer".
In a statement, Mr Ferguson said: "These downloadable guns are unregistered and very hard to detect, even with metal detectors, and will be available to anyone regardless of age, mental health or criminal history".
Eight Democratic attorneys general filed a lawsuit to block the public from getting their hands on the blueprints, arguing unregistered weapons produced by high-tech printers pose a serious safety risk.
Many re-posted them on torrent websites to download software, video and now plastic gun templates for free the scary part is they work.
It has been reported that, although the blueprints were supposed to be made available from Wednesday, they were released early and have already been downloaded thousands of times. "I will be arguing to protect my client's First Amendment rights", he said on Tuesday.
Sen. Chuck Schumer questioned Trump - as the president's administration settled a case with Defense Distributed to make the blueprints available.
But gun rights advocates, like Ben Hertel, who manages Rocklin Armory, disagree.
"Regardless of what a person may be able to publish on the Internet, undetectable plastic guns have been illegal for 30 years", Chris Cox, executive director of the NRA's Institute for Legislative Action, said in a statement.
The second measure is meant to ensure that even guns primarily made of plastic can be discovered by metal detectors.
The judge has scheduled a hearing on August 10.
"This is a tremendous win for public safety and common sense", Shapiro said in the release.
President Trump weighs in on 3D-printed guns.
Heather Nauert, State Department Spokeswoman says, "What this gets down to is a domestic case where it's a domestic gun control issue that needs to be addressed, not just by Congress but also by law enforcement". He understands concerns about the guns' ability to be detected, but laws already make it illegal for people to possess undetectable guns. "It is temporary - and we'll be back in court immediately seeking a preliminary and permanent injunction". The petition for the temporary restraining order was filed in federal court in Seattle.
If bans on so-called assault weapons, high-capacity ammunition magazines and bump stock accessories won't stop criminals from getting such weaponry, as the NRA frequently says, why should we believe that the Undetectable Firearms Act is a sufficient safeguard against the proliferation of firearms that can skirt security measures?