Every Mission you complete you'll get an individual Weapon Upgrade specific to each Character (i.e. Graves & Lang)! You can also use any unlocked Weapon Upgrades in any unlocked Mission at any difficulty setting under the Replay Mission Menu.
Unlockable | How to Unlock
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200-Round Magazine Capacity for the LMG 5.56mm (for Lang) | Complete 3 Missions
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25% increased Rate of Fire for the LMG 5.56mm (for Lang) | Complete 7 Missions
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40mm Grenade Launcher Attachment for the LMG 5.56mm (for Lang) | Complete 2 Missions
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Automatic Shotgun (for Graves) | Complete 8 Missions
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Flashbangs (for Graves & Lang) | Complete 4 Missions
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Foregrip for the LMG 5.56mm which increased stability and reduces recoil when used (for Lang) | Complete 9 Missions
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Gun Camera for the 7.62mm Sniper Rifle (for Graves) | Complete the first Mission
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HEAT Rocket Launcher (for Lang) | Complete the first Mission
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Incendiary Grenade (for Lang) | Complete 5 Missions
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Proximity Mine (for Graves) | Complete 6 Missions
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Shotgun Attachment (for Graves) | Complete 2 Missions
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Suppressor for the 7.62mm Sniper Rifle (for Graves) | Complete 3 Missions
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