A federal judge yesterday dismissed the Gun Owners’ Action League’s challenge to the state’s copycat assault weapons ban, providing a big win for Attorney General Maura Healey, who targeted the weapons after the mass shooting at the Pulse nightclub in Orlando, Fla., and drawing immediate criticism from the NRA.U.S. District Court Judge William G. Young in Boston upheld the state ban, stating the Second Amendment does not cover copycats of assault-style weapons, such as the Colt AR-15, or large capacity magazines, which were also regulated in the ban.