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This piece replaces the often broken top cannon of the Starcom Tornado Gunship.
In order to replace your faulty one, you will need to remove the top cannon assembly from the gunship, unscrew it and open the two halves carefully. The original red cannon will simply fall out and you can replace it with the new version.
When prying open the two halves, be careful not to break the small pegs that keep the assemlby together. They are located in the back, so again, please be careful!