Police have charged a 50-year-old after a search warrants on two properties, including the Duncraig home of bikie Troy Mercanti.
It is understood police went to the properties as part of the investigation into the stabbing of a Mongols bikie in Balga last month.
During the search of a Henley Brook home, officers allegedly found cannabis, a handgun and several items of interest in relation to the stabbing. A dagger was also allegedly found inside a vehicle parked in the garage of the home.
The 50-year-old man has been charged with possessing a prohibited drug, possessing a controlled weapon, possessing a fire arm or ammunition and possessing an unlicensed firearm.
He was also charged with having no authority to drive in relation to an alleged driving offence on October 30 and is due to appear in Midland Magistrate's Court on January 3.
During the incident last month, a 32-year-old man was found badly injured and allegedly carrying crystal meth in Olney Court, where the motorcycle gang have their clubhouse.
The man was subsequently charged with three gun offences, possession of a prohibited drug with intent to supply and criminal damage.
Mercanti was expelled from the Coffin Cheaters bikie gang and became a founding member of the Finks, which were recently "patched over" by the Mongols nation-wide.
In March he was sentenced to six years and ten months jail for serious assaults on the mother of his two sons, Tammy Kingdon, over their 15-year relationship.