In light of the Supreme Judge's gun rights ruling earlier this year, a federal court blocked a law forbidding the possession of a firearm with a "altered, destroyed, or deleted" serial number.
U.S. District Judge Joseph Goodwin decided that no historical norm shows that weapons without serial numbers are more dangerous or uncommon, hence the legislation is unconstitutional.
In his order, he said he's complying by the Supreme Court's June ruling in New York State Rifle & Pistol Association v. Bruen, which struck down a New York gun-carrying regulation.
The court decided that requiring applicants to show a "special necessity" to carry a gun outside the house beyond self-defense violates the Second Amendment.
In his majority judgement, Justice Clarence Thomas said gun rules should follow historical trends.
Goodwin ruled that a pistol without a serial number in 1791 was neither more hazardous or uncommon since serial numbers were not popular.