About 8.30am Strike Force Raptor officers searched the premises and seized three pistols, two shotguns, ammunition and quantity of amphetamine and cannabis.
A 63-year-old man was arrested at the scene and was taken to Fairfield police station.
He was charged with multiple counts of possessing an unauthorised pistol, possessing an unauthorised firearm, possessing ammunition without a licence, possessing a prohibited drug and two counts of not keeping firearms safe.
The man was granted conditional bail to face Fairfield Local Court on July 18.
Strike Force Raptor is a proactive police operation targeting outlaw motorcycle gangs and their alleged associated criminal enterprises.