Black Ops II - Gun Nut Achievement

Unlock this achievement by completing a level with a customized loadout.

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What you want to do is use the create a class feature you see before you start a campaign mission, it is located to the bottom right of the screen. Choose any weapon you want, any attachment, camo, etc. When you have created your custom class, just start the level and completely finish it. At the end of the mission you will unlock the achievement.

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Video by Mattie432: