Denver is making it illegal to sell, carry or possess bump stocks, which allow semi-automatic weapons to mimic fully automatic guns.
The Denver City Council voted 11-1 Monday night in favor of the measure. It’s largely symbolic because the city already bans the types of semi-automatic rifles that can be modified with bump stocks.
Columbia, South Carolina passed a similar measure last month and several states already ban the devices.
Authorities say the gunman who opened fire on a Las Vegas music festival in October, killing dozens and wounding hundreds of people, had equipped a number of guns with bump stocks.
A ban has also been proposed at the Colorado Legislature but it faces a difficult time passing the Republican-controlled state Senate.
