A Mongols associate has been charged after Gang Crime Squad detectives raided a Shoalwater home.
Officers allegedly seized a shotgun, four rifles, two firearm silencers, ammunition and cannabis plants from the Fifth Avenue property on Sunday.
The 71-year-old Mongols associate has been charged with a string of firearm offences and will appear in the Rockingham Magistrates Court on Monday, December 21.
Detectives also raided the Mongols Clubhouse and allegedly found a quantity of cocaine.
A 30-year-old man from Newman was charged with breaching a post sentence supervision order and a 33-year-old man from Ashby was charged with possessing a prohibited drug with intent to sell or supply.
They both appeared in the Joondalup Magistrates Court today.
The Hells Angels Clubhouse was also searched on Sunday.
Officers allegedly found weapons and prescription medications.
The raids come after the fatal shooting of Rebels senior bikie Nick Martin at Perth Motorplex in Kwinana on Saturday night.
Daniel Bandy appointed CEO of Peel Thunder Football Club
Dwellingup comes alive ahead of Dwellingup 100 and Mighty Jarrah Trail Run event
Man charged, others on the run after Mandurah Forum knife incident
Man critically injured in North Dandalup crash
Kwinana Recquatic's swim school recognised nationally
Rockingham Police: Locals advised not to approach wanted man
Concerns for missing girl
Peel Thunder cruise into 2026 WAFL grand final
Two teens cautioned, one charged over brutal Falcon attack