The Justice Department issued the rule in December, deciding that existing prohibitions against fully automatic weapons also covered bump stocks. The bump stock uses recoil effects to bounce the rifle off the shooter's shoulder and bump the trigger back into the trigger finger. This speeds up what the rate of fire would have been without the bump stock. How the ban came aboutSoon after the Las Vegas shooting, President Donald Trump vowed to outlaw bump stocks. Some gun-owner advocacy groups sued the Justice Department , asking a federal court to prevent the ban.

Source: CNN March 25, 2019 10:52 UTC