WASHINGTON — The National Rifle Association joined the Trump administration and top congressional Republicans Thursday in a swift and surprising embrace of a restriction on Americans' guns, though a narrow one: to regulate the "bump stock" devices the Las Vegas shooter apparently used to horrifically lethal effect.The devices, originally intended to help people with disabilities, fit over the stock and grip of a semi-automatic rifle and allow the weapon to fire continuously, some 400 to 800 rounds in a single minute. Bump stocks were found among the gunman's weapons and explain why victims in Las Vegas heard what sounded like automatic-weapons fire as the shooter rained bullets from a casino high-rise, slaughtering 58 people in a concert below and wounding hundreds more.Thursday's sudden endorsements of controls came almost simultaneously from the NRA and the White House.The NRA, which famously opposes virtually any hint of new restrictions, said in a statement: "The National Rifle Association is calling on the Bureau of Alcohol, Tobacco, Firearms and Explosives (BATFE) to immediately review whether these devices comply with federal law. The NRA believes that devices designed to allow semi-automatic rifles to function like fully automatic rifles should be subject to additional regulations."Moments after, at the White House, press secretary Sarah Huckabee Sanders praised the announcement."We welcome that and a conversation on that," Sanders said.