A federal ban on bump stocks takes effect in 90 days.
Owning the weapon modification will become a felony.
The gunman in the October 2017 mass shooting on the Las Vegas Strip used the accessory, which simulates automatic gunfire when applied to a semi-automatic weapon.
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Under the new rule, bump stocks will be classified as “machine guns.”
Owners of bump stocks will have 90 days to dispose of or turn in the devices.
