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Bump stocks, the device that allow's semi-automatic rifles to mimic the rapid fire of machine guns, were attached to a half-dozen of the long guns found in the hotel room of the Las Vegas shooter who in October 2017 killed 58 people and injured hundreds more attending a nearby outdoor concert. (Las Vegas Metropolitan Police Department)

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Justice Department proposes banning rapid-fire bump stocks

The Trump administration said Saturday it has taken the first step in the regulatory process to ban bump stocks, likely setting the stage for long legal battles with gun manufacturers while the trigger devices remain on the market.

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States and cities are taking the lead on bump stock bans

In the immediate aftermath of the deadliest mass shooting in modern U.S. history, there was a fevered pitch to ban bump stocks, the device that allowed the shooter's semi-automatic rifles to mimic the rapid fire of machine guns.