From Halopedia, the Halo wiki
The ship was originally created with the highest protection measures. Following it's purchase by Elld, the ship was upgraded to have the latest surveillance technology and armed.
The Flintlock was commissioned by Harris-Romner Bank to transport private and commercial valuables physically from place to place. It was eventually sold to the Yonhet Elld and his investors and then parked by him on Komoya. From then on it served as a financial district on the moon.
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