They allegedly found more than two kilograms of methylamphetamine, along with $72,500 in cash and 14 fully operational 3D-printed firearms.
The border operations squad were alerted in September after getting a tip-off about gun-trafficking and drug sales.
On October 15, police searched the Duncraig home and arrested the 36-year-old where they allegedly seized some 3D-printed weapons, the cash, and the drugs.
Two days later, officers found more guns buried in bushland in Bullsbrook.
The 36-year-old Duncraig man has been charged with a string of offences, including 21 counts of firearm possession “with circumstances of aggravation”, 10 counts of drug possession, three counts of firearm manufacture, and further drug and firearm charges.
He is expected to appear in Joondalup Magistrates Court on November 11, 2024.
WA police said they expect other parties will be charged in the investigation.
Detective Superintendent John Hutchison said the man is believed to be a significant member of an organised criminal network in Perth.
“The arrest of this organised crime player has resulted in significant disruption to a crime group and the distribution of methylamphetamine, privately manufactured firearms and the laundering of the proceeds of this offending,” Hutchison said.
“This arrest is only the beginning of what will be an extensive investigation.
“There is clearly a broader network of criminals involved and we are committed to identifying who they are and bringing them to justice.
“Every stolen or illegal firearm poses a real risk to the community and also to our officers, particularly the concealable handguns and 3D-printed firearms.”