The Supreme Court in a 6-3 vote Friday threw out a Trump-era ban on bump stocks ... replace the standard stock on a rifle, such as a semiautomatic AR-15–style or AK platform firearm.

A bump stock replaces a rifle’s standard stock, allowing the weapon to slide back and forth rapidly. Bump stocks are commonly used on AR- and AK-style rifles and allow up to 800 shots per minute, ...