Superintendent Reynolds said Bankstown police were still hunting for the assailants.
“We believe the five men responsible for this brutal attack fled the area in a white hatchback,” he said.
“It’s very early investigation, but certainly we believe it was a targeted attack, and that the two groups had arranged to meet.”
Superintendent Reynolds said it was unclear for what the men had arranged to meet. He added there were no links to organised crime, and the 19-year-old victim had “insignificant” contact with the justice system.
The teenager remains in a critical condition after undergoing emergency surgery at Westmead Hospital.
The passenger, who did not need medical treatment, has been interviewed by police.
Superintendent Reynolds appealed for anyone with information about the shooting or the white hatchback involved to either contact Bankstown police or Crime Stoppers.
Police were also urging anyone who had been near Anderson Lane, Helen Street, Wellington Road or Sefton Railway Station about 11.45pm on Friday to contact Bankstown police station.
Superintendent Reynolds assured the community it was not a random event.
“We do believe that it was a targeted attack, not a random attack,” he said.