U.S. gun lobby agrees to examine 'bump stocks' after Las Vegas massacre

(Adds NRA urging regulatory controls rather than legislation to address bump stocks, candlelight vigil for slain policeman, weekend gun show reported canceled, paragraphs 12, 14-16)

By Alexandria Sage and Sharon Bernstein

LAS VEGAS, Oct 5 (Reuters) - The U.S. gun lobby, which has seldom embraced new firearms-control measures, voiced a readiness on Thursday to restrict a rifle accessory that enabled a Las Vegas gunman to strafe a crowd with bursts of sustained fire as if from an automatic weapon.

Police have said the gunman, Stephen Paddock, equipped 12 of his weapons with so-called bump-stock devices that allow semi-automatic rifles to operate as if they were fully automatic machine guns, which are otherwise outlawed in the United States.

Authorities said his ability to fire hundreds of rounds per minute over the course of 10 minutes from his perch in a 32nd-floor hotel suite was a major factor in the high casualty count of 58 people killed and hundreds wounded. Paddock, 64, killed himself before police stormed his suite.

The carnage on Sunday night across the street from the Mandalay Bay hotel ranked as the bloodiest mass shooting in modern U.S. history, surpassing the 49 people shot to death last year at a gay nightclub in Orlando, Florida.

The influential National Rifle Association (NRA), which staunchly opposed moves to tighten gun control laws following the Orlando massacre and others, said on Thursday that bump stocks, which remain legal, "should be subject to additional regulations."

Senior Republicans also signaled they were ready to deal with the sale of bump stocks - an accessory gun control advocates regard as work-arounds to bans on machine-guns.

"Clearly that's something we need to look into," House Speaker Paul Ryan told radio talk show host Hugh Hewitt.

"I didn't even know what they were until this week ... I think we're quickly coming up to speed with what this is," Ryan said.

The No. 2 Republican senator had called for a review of bump stocks a day earlier. Democrats were already urging new legislation, as the shooting reignited the long-standing U.S. debate over regulation of gun ownership, protected under the Second Amendment of the U.S. Constitution.

U.S. Representative Steve Scalise, a member of the Republican House leadership who is himself a victim of gun violence, voiced concern that hasty congressional action to restrict bump stocks could lead to wider limits on "the rights of gun owners."

"There are people who want to rush to judgment," Scalise said in an MSNBC interview on Thursday.

The NRA called for the U.S. Bureau of Alcohol, Tobacco, Firearms and Explosives to address bump stocks by regulation, rather than opening up the issue to the legislative process.