It would be cool if you could have duel wield with hand canons. you would have 2 hand cannons (or side arms) and have only 1 other weapon, a special or primary depending on what you are using duel wield with.
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You only need one hand cannon, using two is an admission of failiure.
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This would be cool, but I feel this would lead to the last word being dual wielded and a swift nerf. My .02