N.R.A. Budges, Backing Limits on Rapid-Fire Device for Guns

The National Rifle Association on Thursday endorsed tighter restrictions on devices that allow a rifle to fire bullets as fast as a machine gun — a rare, if small, step for a group that for years has vehemently opposed any new gun controls.

Twelve of the rifles the Las Vegas gunman, Stephen Paddock, had in a high-rise hotel suite when he opened fire on a crowd on Sunday were outfitted with “bump stocks,” devices that allow a semiautomatic rifle to fire hundreds of rounds per minute, which may explain how he was able to shoot so quickly, killing 58 people and wounding hundreds of others. The federal Bureau of Alcohol, Tobacco, Firearms and Explosives has ruled that bump stocks do not violate laws that tightly limit ownership of machine guns, and some lawmakers have called for them to be banned.

On Capitol Hill, support appeared to grow for a ban on the bump stock devices, either through regulation or legislation, as Republicans — who for decades have rejected any form of gun restrictions — began increasingly to speak out. Several leading Republicans, including Senator John Cornyn, the No. 2 Republican in the Senate, have raised serious questions about the devices.

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