A federal gun buy-back scheme is already facing opposition from at least one state. Photo: Joel Carrett/AAP PHOTOS One state has publicly rejected Australia's biggest gun buyback since the Port Arthur massacre while another has left the door open to walk away. Subscribe now for unlimited access. or signup to continue reading Holiday Offer All articles from our website & app The digital version of Today's Paper Crosswords, Sudoku and Trivia All other in your area Queensland's Liberal-National government confirmed it would not support the scheme just hours after it passed federal parliament. "Queensland won't be going down the path...