Police have charged a man on the same day they discovered a haul of firearms in bushland south of Perth that they said was connected to a major gun store robbery last week.

Key points: About 100 firearms were stolen from Western Australia's biggest gun store

About 100 firearms were stolen from Western Australia's biggest gun store The thieves used power tools to cut through a solid wall and enter the premises

The thieves used power tools to cut through a solid wall and enter the premises Police have found about 20 weapons linked to the heist dumped at Bibra Lake

Thieves cut through thick concrete walls to gain access to the Claremont Firearms store in Yangebup in the early hours of Friday morning, stealing about 100 long arm rifles and handguns.

Police yesterday said they recovered between 10 and 20 firearms buried in Bushland in Bibra Lake, in Perth's south.

Detective Inspector Peter Foley from the WA Police Serious and Organised Crime Division said the guns were believed to be linked to the Yangebup heist.

Claremont Firearms in Yangebup is one of Western Australia's largest gun shops. ( ABC News: David Weber )

He said a member of the public had found something suspicious in the bush and alerted police.

"Examination of the bush site has revealed a number of firearms and materials associated with the burglary at Claremont Firearms," Detective Inspector Foley said.

"We've developed a number of lines of investigation from this discovery, but again I'll stress there are firearms still in the public and our number one priority is recovering those firearms and any information is paramount to the success of the investigation."

Police also said a 27-year-old man was arrested the Hamilton Hill area yesterday in connection with the burglary.

The thieves were believed to have used a white Toyota Hilux during the robbery, which was stolen from Cockburn Central Shopping Centre and later found burnt out in North Lake.

Detectives appealed for information about a stolen Toyota Hilux linked to the burglary. ( Supplied: WA Police )

The man has been charged with aggravated burglary, stealing, stealing a motor vehicle and criminal damage by fire.

He was refused bail and is due to appear in Fremantle Magistrates Court today.

Midnight heist was highly organised

Police were alerted to the break-in at Claremont Firearms on Erceg Road when an alarm went off about 11.30pm on November 21.

The thieves entered the premises by using power tools to cut through an exterior concrete wall in a neighbouring property on Cutting Way.

An outer wall and an inner wall were cut through to gain access to the store and steal about 100 firearms. ( Supplied: WA Police )

Police said about 100 firearms, mostly handguns and some long-barrel firearms, were stolen from the store.

"The preparation and research is obviously very extensive," Detective Inspector Foley said following the break-in.

"It's a well-orchestrated criminal act, there has been a bit of preparation.

Police said the store owner had appropriate security measures installed, but he had encountered a "well-planned and well-organised" group that used "extreme measures" to enter the building.

"All the [stolen] firearms were contained in the strong or safe room in the building," Detective Inspector Foley said.

"Obviously it's taken some time to do the cutting and take the firearms of this number, they would have been there for some time."

Detective Inspector Foley asked any members of the public with any related information or dashcam footage of the Hilux driving in the vicinity of North Lake Road and the Bibra Lake industrial area on Thursday evening and the early hours of Friday to contact police.