The item was found when officers were searching the property in Overtoun Court on Dunswin Avenue as part of another ongoing investigation.
A 26-year-old man has been charged in connection with an alleged firearms offence.
A cordon was put in place and several properties were evacuated as a precaution.
EOD personnel attended and carried out a controlled explosion on the device.
READ MORE: Police update after ‘suspect item’ found in Clydebank
Around 2.30am on Tuesday, October 29, 2024, it was safe for local residents to return to their homes.
Officers remain at the scene and enquiries are continuing.
Chief Superintendent Gary I’Anson, Divisional Commander for Argyll & West Dunbartonshire said: “I would like to extend my thanks again to the local community for their patience as we dealt with this incident.
“I understand the inconvenience it will have caused and I am grateful for your cooperation.”
