They don't even understand gun policy in general.

Via Guns.com: 

Federal attorneys said those seeking to stop the distribution of 3D printed gun files in court are missing the mark on their argument...

“[T]he Government notes that the possibility of manufacturing small-caliber firearms from a 3D-printing process has been publicly discussed since 2013,” said U.S. Attorney Annette L. Hayes in a 26-page filing opposing Ferguson’s motion for the court to issue an injunction against the files release. Hayes elaborated that the government “has no authority to restrict U.S. persons from sharing these files with other U.S. persons within the United States,” arguing that the State Department’s move to throttle Wilson’s distribution of his files five years ago was over concerns that it was a violation of international arms regulations.

Within the State Department, the Directorate of Defense Trade Controls is responsible for regulating arms exports in compliance with the International Traffic in Arms Regulations, a 1970s-era regime designed to safeguard national security interests. The recently appointed head of DDTC, Sarah Heidema, in the government’s filing this week, said that the 3D gun files at the heart of the case are small potatoes for an organization tasked with preventing the questionable transfer of items such as attack helicopters, torpedoes, cruise missiles and space launch vehicles.

Further, many of the gun files that Wilson plans to distribute, for firearms such as the AR-15 and the M9 handgun, have been in the public domain for generations, for which Heidema pointed out such blueprints and designs ITAR does not cover. Heidema said regulation of most designs for commonly available semi-automatic small arms under .50 caliber were assessed by the Pentagon as having little military advantage. Heidema elaborated, for example, that the Beretta M9 is “available for sale at sporting goods stores and other retailers throughout the country” and has long been licensed for export commercially around the world.

Finally, the government points out that current federal law, the Undetectable Firearms Act, requiring at least 3.7-ounces of steel in a firearm made or otherwise imported into the country, already makes “plastic” guns illegal and on Thursday, U.S. Attorney General Jeff Sessions said he was ready to back that it up.

Read more here.