You know the riot shield thats attached to the KSG Shotgun? I think we take that riot shield and sell it separately for dual wield guns, such as the deagle, mk23 etc. Eg. You have a Deagle and a riot shield in your inventory. When you have the deagle in your hotkey it has an option to equip the riot shield with your deagle. Now this may seem overpowered, So the riot shield should need to be repaired more frequently then guns. When it is damaged, the damage block % lowers from 100% to 75% then 50% then so on and so forth. Just an idea I came up with while in the shower, so don't judge me.
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