A viable improvised explosive device, four firearms and drugs worth €45,000 were seized during raids in Co Carlow on Thursday and Friday.
Gardaí carried out searches on a number of properties as part of investigations into the sale and supply of drugs and related criminal activity.
Two men in their 40s were arrested and are being held for questioning under Section 30 of the Offences Against the State Act.
A gun and ammunition were discovered by gardaí from Carlow Drugs Unit at a home in Carlow town on Thursday.
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The improvised bomb was found in a follow-up search that day at a residence in Kernanstown, close to Carlow town.
The Defence Forces Explosive Ordnance Disposal squad removed the device for a controlled explosion to be carried out. A Garda cordon had been established around the property during the incident.
Searches on Friday at the two properties, with the assistance of the Garda dog unit, led to the discovery of two 3D-printed firearms, a shotgun and ammunition.
Suspected cocaine with an estimated street value of €35,000 and cannabis with an estimated street value of €10,000 was also recovered.
The firearms will be subject to further ballistic testing and forensic analysis, and the drugs will be sent to Forensic Science Ireland. Investigations are ongoing.