The obvious problem with dual gun is that when a gun is balanced to be used alone, it would be OP to be able to use 2 of them : twice the damage output is a huge difference. Yet, dual guns would be cool ! (especially akimbo pistol on LA) One simple fix could be this one : Pretends dual weapons use a special kind of low recoil ammo (certifiable) that diminish damage by a factor (gun dependent). But I find it a little bit boring, so I'd rather have this one : Pretends dual weapons use a special kind of low recoil ammo that's less effective against infantry shield (not heavy shield). Basically, it deals half damage to the shield, and full damage to health. So the overall effectiveness is less than 2 : it does normal damage half the time, and double damage half the time, hence 1.5 times the damage of a single gun. Considering the average pistol have 2/3 of the DPS of the average automatic weapon, it balances out nicely. This second fix have the nice advantage that even the Max could be rebalanced : their standard gun are weak because of the dual weilding hability. With such a mechanism, they could be buffed safely to 2/3 of their actual power.