Neither, it needs to have its reload speed increased. That's all.
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Use the gunslinger subclass. Problem solved.
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Finally someone who has a simple solution to a minor problem
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For clarification, ´useability in general´ refers to either Rate of Fire, Reload time, Range, Stability, ADS time, Suppression, Suppression Resistance, or any other trait of the weapon not directly related to damage output, or a combination of the above.