BOSTON — Massachusetts is on its way to becoming the first state since the Las Vegas shooting massacre to outlaw devices that allow semi-automatic weapons to mimic fully automatic guns.

The Massachusetts Senate voted 33-0 on Thursday to ban the sale of bump stocks and trigger cranks, attachments that increase the firing rate of a weapon. A day earlier the state House voted 151-3 in favor of a bump stock ban.

The two versions must be reconciled before a final bill is sent to Republican Gov. Charlie Baker, who has said he would sign a ban if it reaches his desk.

A bump stock fits over the stock and grip of a semi-automatic rifle and allows the weapon to fire continuously. The Las Vegas shooter had 12 weapons fitted with such devices.

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