Police were called to a home on Aberdeen Street in Bossley Park about 6.30am yesterday.
Officers arrived at the home and found multiple shots had been fired into the house and a car parked out front from an Audi sedan before it fled the scene.
The residents, aged in their 80s, were unharmed.
The home was sprayed with bullets twice in two days, with police believing the owners of the house were innocent with no links to criminal activity.
Police located the abandoned Audi after it crashed nearby at the intersection of Mimosa and Prairie Vale Road.
The occupants of the vehicle allegedly fled the scene on foot.
During a search of the sedan, police allegedly seized an automatic firearm believed to be an AK-47.
A crime scene was established at the home and the place of the crash.
At 1.30pm yesterday, police executed a search warrant at an address on Woodville Road in Fairfield West and arrested a 22-year-old man.
The man was taken to Cabramatta Police Station and was charged with firing a firearm at a dwelling, as well as organised crime activity and participating in a criminal group.
He was refused bail and faced court today.
During the Fairfield West search, police said they also found a shortened calibre rifle, ammunition, and several mobile phones.
About 6.15pm yesterday, officers stopped a vehicle on Camden Valley Way in Leppington and arrested a 16-year-old boy.
He was taken to Campbelltown Police Station and was charged with a string of offences, including firing a firearm at a dwelling, as well as organised crime activity and participating in a criminal group, contributing to criminal activity.
The 16-year-old was refused bail.
Detectives executed a search warrant at an address on River Mint Avenue in Leppington about midnight, seizing ammunition and clothing.
