A coalition of gun-control groups has filed an appeal in federal court seeking to block a recent Trump administration ruling that will allow the publication of blueprints to build a 3D-printed firearm.
The firearms are made of polymer that can't be flagged by metal detectors. They're also untraceable because the guns are homemade and don't have serial numbers.
The State Department ruled in late June that . The decision resolved a long-lingering dispute with . He owns that specializes in that can be made with a 3D printer.
On Thursday, gun-control groups asked a federal court for a temporary injunction to block the State Department decision from taking effect.
 Took a break from the rifles today and worked on this @polymer80inc. @frankproctorshooting sights and upper parts and we should be all set. Back to the AR builds when we return from @shotshow. #ghostgunner2 #diy #builtnotbought #buildit #80percent #ar15 #dailyrifle #Polymer80 #p80 #glock #gunporn A post shared by Ghost Gunner (@ghost_gunner2) on Jan 21, 2018 at 2:58pm PST
AP's Lisa Marie Pane reported this story.