A group of U.S. gun-makers and a firearms distributor on Nov. 22 filed a joint motion to dismiss a claim by the Mexican government that the companies are liable for allegedly contributing to a surge of firearms flowing unlawfully into the country. It comes after Mexico on Aug. 4 filed a suit in Massachusetts federal court accusing some of the nation’s biggest firearm makers, including Smith & Wesson, Sturm, Ruger & Co, and Glock, of “persistently supplying a torrent of guns” to drug cartels in Mexico. “Defendants are fully on notice of the massive trafficking of their guns into Mexico,” the lawsuit states, accusing the firearms makers of creating a “public nuisance” in Mexico. Andrew Lelling, a former U.S. attorney for Massachusetts, filed the motion on Monday on behalf of the U.S. gun makers, while former U.S. solicitor Noel Francisco did so on behalf of Smith & Wesson. The attorneys …