ATLANTA — One of the nation’s leading gun-control groups has filed a lawsuit against the makers and sellers of “bump stocks,” the devices used by the gunman in what is now the deadliest mass shooting in modern U.S. history.The Brady Center to Prevent Gun Violence filed the lawsuit on behalf of victims of the Oct. 1 shooting in Las Vegas. The lawsuit claims that the leading manufacturer of the devices misled federal authorities about their intended purpose and marketed them to thrill-seeking gun enthusiasts who wanted the experience of firing a fully automatic weapon that is otherwise greatly restricted under federal law.The lawsuit was filed Friday in Clark County District Court in Nevada; it has three named plaintiffs — all victims of the shooting — and seeks class-action status. It’s not the first time that the Brady Center has filed a lawsuit after a high-profile shooting, seeking to hold gunmakers and others in the industry accountable.Slide Fire Solutions, the Texas-based company that is considered the top manufacturer of “bump stocks” did not return an email message sent Tuesday through its Facebook page seeking comment. Its voicemail box was not accepting messages and the company has not commented since the shooting took place.The devices were originally intended to help people with disabilities who have arm mobility issues fire a semi-automatic long gun. It replaces the stock and pistol grip and allows the weapon to fire continuously, mimicking a fully automatic firearm. Bump stocks were found among the weapons used by Stephen Paddock as he shot from a Las Vegas casino high-rise Oct. 1, killing 58 people at a concert and wounding hundreds.