Whenever you load into patrol or an activity, reloader mods do not work as intended and have no effect at all on reload speed
The only temporary solution I have found is to remove the reloader mods and re-apply them. The can be done quickly using loadouts but it is rather inconvenient.
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True of almost every mod right now. If you die you have to unequip and then re-equip mods to fix it. Every time you die.