Members of the VIPER Taskforce seized shotguns, rifles and a handgun.
Police said a 60-year-old man, who they allege had links to the Rebels outlaw motorcycle gang, had failed to notify police of his change of address, which was a requirement for someone subject to an FPO.
Two searches were executed at residential addresses believed to be linked to the man, in Tyaak and Forest Hill.
Police will allege the man was found in possession of a pump action shotgun, a handgun and over 100 rounds of ammunition, all of which were seized.
Police said he is expected to be charged with firearms offences.
Investigators also seized two 12-gauge shotguns, three rifles and an air rifle, which belong to the registered firearm owner living at the address, police said.
The six firearms were lawfully obtained and stored, but under Section 112 of the Firearms Act, it is an offence for the subject of an FPO to reside or remain at a location where firearms are present.
The six firearms will be stored by police until a suitable alternative location can be arranged.
Anyone with information on illicit firearm activity is urged to contact Crime Stoppers on 1800 333 000 or submit a confidential report at crimestoppersvic.com.au
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