In this Oct. 4, 2017, file photo, a device called a “bump stock” is attached to a semi-automatic rifle at the Gun Vault store and shooting range in South Jordan, Utah. The Supreme Court has agreed to decide whether a ban on gun attachments that allow semi-automatic weapons to fire rapidly like machine guns violates federal law. The justices said Friday they’ll hear arguments next year over a gun bump stocks regulation the Justice Department implemented after the 2017 Las Vegas mass shooting. (AP Photo/Rick Bowmer, File)