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 firearm.

The firearms are made of polymer that cannot 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 directions for building the weapons could be published. The decision resolved a long-lingering dispute with Cody Wilson, who wanted to do so. He owns a Texas-based company that specializes in “open source” firearm designs 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.

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