Maryland’s ban on “bump stock” gun additions has survived court challenges, after an appeal to the Supreme Court was denied.

The Maryland law, passed in 2018, preceded a federal ban on similar equipment. Gun rights advocates had protested the move.

From coverage from the Associated Press:

The high court on Monday turned away a challenge to the ban, which took effect in October 2018. A lower court had dismissed the challenge at an early stage and that decision had been upheld by an appeals court. As is typical, the court didn’t comment in declining to take the case.

A bump stock is a device attached to a rifle, to create a simulated automatic firing action, based on the gun’s movement after firing.

Federal regulations outlawing the items are available online from the Bureau of Alcohol Tobacco and Firearms.

The court ruling means that Maryland’s state law would remain in place, even if the federal government opted to repeal or weaken its ban.