The suit, filed by Campbell and 16 state attorneys general nationwide, specifically targets the U.S. Bureau of Alcohol, Tobacco, Firearms, and Explosives.

The Trump administration, reversing a Biden-era policy, had said it would return thousands of confiscated devices that allow rapid firing, even in states where they are banned.

The device allows semiautomatic weapons to fire more rapidly. Federal officials had classified them as machine guns, effectively making them illegal.