Drugs worth more than $300,000 and a pistol have been seized in a series of raids in Dunedin.
Four men aged between 25 and 45 were arrested yesterday and face charges including production, supply and possession of MDMA, ketamine and eutylone.
Detective Inspector Stu Harvey said a large amount of the drugs were being sold as MDMA but were believed to be eutylone, a synthetic stimulant.
About $20,000 in cash was also seized.
The four men are due to appear in the Dunedin District Court today.