A senior Mongols motorcycle gang member, who has been on the run for nearly a year, has as been arrested.

The 27-year-old man was arrested at an address in Waipara, just after 4:30pm.

AOS police officers were seen at the address this afternoon.

Detective Inspector Paul Newman from the National Organised Crime Group said a military-style semi-automatic firearm was also located.

The man first had warrants for his arrest issued in May last year in Auckland.

He was wanted for serious drug dealing, firearms, and money-laundering allegations relating to Operation Nestegg.

He will appear in the Christchurch District Court tomorrow facing several charges.