How to unlock Mark of the Survivor camo in MW3 and Warzone

Hi guys Does anyone know how or if there is already a post on how to unlock the third and fourth weapon slots with gibbed? I skipped normal

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unlock slot Level 2 3 Level 1 Spell Level 1 Spell Slots Unlocked: 3: You Spend Sorcery Points to unlock a Spell Slot Create

unlock second insured slot dmz you are limited to 10 and have to pay 50 caliber per each extra slot to expand it to a maximum of 28 costing 900 caliber