Families who lost loved ones in the 2012 Sandy Hook school massacre can proceed with their wrongful-death lawsuit against Bushmaster Firearms International, manufacturer of the AR-15 rifle used to kill 20 children and six adults, a Connecticut Superior Court judge ruled on Thursday. In a ruling likely to stir the gun-control debate and the Democratic presidential primary, Judge Barbara Bellis rejected arguments made by Bushmaster, a division of Remington Arms, and its co-defendants, who sought to have the lawsuit dismissed. Bushmaster argued immunity from liability under a U.S.