Gardaí seized a firearm during the course of a search in the Finglas area of Dublin on Friday evening.
The search operation was carried out by the District Drugs Unit in Finglas with assistance from a number of local units.
During the operation, an AK-47 was located at the scene along with cannabis valued at approximately €12,000.
The firearm and drugs will now be sent for analysis at the Garda Ballistics Unit and Forensic Science Ireland respectively.
No arrests have been made. Investigations are ongoing, gardaí said.