what plugin i am looking for is something that can work with zonemanager to where it will grant the user unlimited ammo upton entering the zone and then revoking the unlimited ammo when leaving the zone

but so it works with any permissions.

if some one would like to message me with a answer about making this that would be great.

With this two hooks from zone manager
void OnEnterZone(string ZoneID, BasePlayer player) // Called when a player enters a zone
void OnExitZone(string ZoneID, BasePlayer player) // Called when a player leaves a zone
and oxide permission grant
main work will be around unlimited ammo. Guess there is a plugin for unlimited ammo. Maybe it could fit to what you need.