WASHINGTON – Sen. Bill Nelson joined legislation today to ban “bump stocks,” devices that allowed the Las Vegas killer to shoot at a far faster rate.

Bump stocks are fitted onto semi-automatic weapons and allow for nearly automatic firing. Legislation Nelson filed with Sen. Dianne Feinstein, D-Calif, and other Democrats would close a current loophole in the law that allows for the modifications.

“I’m a hunter and have owned guns my whole life,” Nelson said in a statement. “But these automatic weapons are not for hunting; they are for killing. And this commonsense bill would, at the very least, make it harder for someone to convert a semi-automatic rifle into what is essentially a fully-automatic machine gun.”

The legislation – which faces tough odds in a GOP-controlled Senate, would ban “the sale, transfer, importation, manufacture or possession of bump stocks, trigger cranks and similar accessories that accelerate a semi-automatic rifle’s rate of fire,” according to Nelson’s office.

Several Republicans on Wednesday expressed support for a ban, providing a possible opening.