ryan hardie scored a brace on his full debut against dumbarton on saturday .
the former celtic full-back 's last goal was also against rangers - he netted the hoops ' winner in a controversial scottish cup quarter-final replay at parkhead in march 2011 .
the 18-year-old had made just four substitute appearances before facing the sons at the dumbarton stadium , but his double put rangers in command after they behind to mark wilson 's second-minute opener .