South Australian police, acting on information from their NSW colleagues, have reported a 35-year-old Elizabeth North man for firearm and drug offences.

It comes after police pulled over a vehicle on the Sturt Highway in Wagga last Tuesday and found more than nine kilograms of cannabis inside.

South Australian police were advised of the incident and a search was conducted at a home north of Adelaide.

Police allege a homemade firearm, ammunition, a machete and drug paraphernalia were located at the Elizabeth North residence.

The man was reported for possessing an unlicensed and unregistered firearm, possessing insecure ammunition, carrying an offensive weapon and possessing drug implements.

He will be summonsed to appear in South Australian court at a later date.

NSW Police Traffic and Highway Patrol Command, Acting Assistant Commissioner Stuart Smith, said the case was an example of cross-border policing at its finest.

"The fight against illegal drugs has no borders," Assistant Commissioner Smith said.

"Police across all jurisdictions regularly exchange information and quite often the result is criminals being locked up and put before the courts."