A judge on Friday dismissed a wrongful-death lawsuit by Newtown families against the maker of the rifle used in the Sandy Hook Elementary School shooting massacre, citing an embattled federal law that shields gun manufacturers from most lawsuits over criminal use of their products. State Superior Court Judge Barbara Bellis granted a motion by Remington Arms to strike the lawsuit by the families of nine children and adults killed and a teacher who survived the Dec. 14, 2012, school attack, in which a gunman killed 20 first-graders and six educators with a Bushmaster AR-15-style rifle made by Remington.