She was one of two people who was arrested during the Garda operation.
The woman in her 30s who had been detained is scheduled to appear before CCJ No. 3, Parkgate St, Dublin today charged in connection with the seizure of the firearm.
The male in his 40s has been released without charge and a file will be prepared for the Director of Public Prosecutions.
The woman was found as part of Gardaí carrying out searches as part of an operation targeting Dissident Republican activity in the Drogheda area on July 11.
Gradaí arrested two people and recovered a firearm.
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