CCTV footage revealed the face of one of the offenders when his mask slipped below his nose.
They left in a white Nissan. shortly afterwards a stolen white Nissan Skyline was found parked in New Brighton Road less than a kilometre from the scene, with the engine still running.
"It is concerning that these offenders have brought a loaded weapon with them and have been prepared to discharge it, " Detective Senior Sergeant Dave Pizzini said.
"Thankfully no one was injured in this incident but we are concerned about the brazenness and determination of these offenders," he said.