NRA backs down over possible ban on 'bump stocks' 

The National Rifle Association, America's biggest gun lobby group appeared to backtrack on Sunday on calls for regulation of deadly "bump stocks", as the country's gun control debate returned to familiar impasse. Only days after the NRA appeared open to a possible ban on the devices which convert semi-automatic guns into fully automatic weapons, the group's leaders began to quibble over the idea. "We don't believe bans ever worked on anything," said Chris Cox, the NRA’s executive director,