It is a bit ambiguous in this case.
The anime finished after the manga:
Anime finished: May 20, 2000
Manga finished: June 19, 1999
... But we could not confirm the source content in MangaUpdates.
Here you have all the anime relations we detected ordered by release date, so you can see the reason for this status in context and also use it as watching order.
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Miami Guns follows the chaotic adventures of Yao Sakurakouji, a wealthy and impulsive girl who joins the Miami police for thrills.
She's partnered with Lu Amano, a seemingly demure but surprisingly sharp-witted officer who also happens to be the police chief's daughter.
The unlikely duo tackles everyday crime while also investigating a shadowy group known only as "The Organization."
Expect plenty of over-the-top action and comedic moments as they try to keep Miami safe, or at least, in one piece.