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              FILE - In this Oct. 4, 2017 file photo, a little-known device called a "bump stock" is attached to a semi-automatic rifle at the Gun Vault store and shooting range in South Jordan, Utah.  New federal rules would be the "the smartest, quickest" way to regulate the device the gunman in the Las Vegas massacre used to heighten his firepower, House Speaker Paul Ryan said Wednesday, Oct. 11  in remarks that suggested Congress was unlikely to act first. It remains unclear, however, what if any action the federal Bureau of Alcohol, Tobacco, Firearms and Explosives will take on so-called bump stocks.  (AP Photo/Rick Bowmer)
FILE – In this Oct. 4, 2017 file photo, a little-known device called a “bump stock” is attached to a semi-automatic rifle at the Gun Vault store and shooting range in South Jordan, Utah. New federal rules would be the “the smartest, quickest” way to regulate the device the gunman in the Las Vegas massacre used to heighten his firepower, House Speaker Paul Ryan said Wednesday, Oct. 11 in remarks that suggested Congress was unlikely to act first. It remains unclear, however, what if any action the federal Bureau of Alcohol, Tobacco, Firearms and Explosives will take on so-called bump stocks. (AP Photo/Rick Bowmer)
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BOSTON — Massachusetts lawmakers have agreed on language that calls for a ban on "bump stocks," devices that can increase the firing rate of a weapon.

The state would be the first to ban bump stocks since the deadliest mass shooting in modern U.S. history.

Investigators say the gunman who opened fire on a Las Vegas music festival, killing 58 people and wounding hundreds more, used the device that allows a semi-automatic firearm to mimic a fully automatic one.

The proposed ban was added to an $85 million budget bill. Republican Gov. Charlie Baker supports a ban.

Lawmakers were initially considering banning any device that attaches to a rifle or shotgun to increase the discharge rate, which gun rights advocates opposed.

They adopted narrower language specifically prohibiting bump stocks and trigger cranks.