My solution is to take rival gangs put them in a large enclosed area so that no gangsters or bullets can escape. Each side has enough pistols and ammo for all members. At this point they can begin good old gang warfare the same way that the Europeans used to have war in the 18th century. The winners get to be executed.

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Scott Diener
89 300E
93 300E
92 Volvo 740 Wagon aka "Mutt mover"