The Supreme Court has rejected an appeal of the federal ban on bump stocks, devices that allow semi-automatic firearms to fire rapidly like machine guns.
The ban took effect nearly a year ago.
The Trump administration directed the Bureau of Alcohol, Tobacco and Firearms to reverse its policy outlining that the devices were legal in 2018.
Sponsor Message
That decision prompted gun rights advocates to sue. The groups have lost in the lower courts and this week the High Court decided not to take up the case.
The ban on the device came after the mass shooting in Las Vegas in 2017 in which a gunman used bump stocks to fire more than 1,000 rounds in 11 minutes, killing 58 people and injuring hundreds.