More than 70 guns have been discovered at a residential property, with one man behind bars.
Police searched a house in Denistone East in Sydney's north on Friday where they seized 27 firearms, 45 other prohibited weapons and thousands of rounds of ammunition.
A 41-year-old man was arrested and taken to Gladesville police station where he was charged with a slew of weapons offences.
He was refused bail to appear before Burwood Local Court on Friday.