Federal Bump Stock Ban Blocked by Divided Appeals Court

The federal ban on bump stocks—devices that increase the rate of fire for semiautomatic weapons—is likely unlawful and must be put on hold, a divided Sixth Circuit said Thursday.

Bump stocks harness a gun’s recoil energy to rapidly move the firearm back and forth, bumping the shooter’s stationary finger against the trigger. In the wake of the 2017 Las Vegas mass shooting, in which a gunman using semiautomatic rifles with bump stocks killed 58 people, President Donald Trump ordered the Justice Department to quickly ban “all devices that turn legal weapons into machineguns.”

Federal law generally bans civilian ownership of ...