How to Obtain: Buy all items from the Survival Equipment Armoury.
Note: You do not have to buy all the items from this Armory all in one Survival match. Purchasing these items are cumulative across all games you play, so just remember which one's you've bought. This Armory comes available at the end of Wave 2/start of Wave 3.
Below is a guide to this Armory and what costs and levels things are:
■Frag Grenade (x4): Level 0 & Costs $1,000
■Flashbang Grenade (x4): Level 0 & Costs $1,000
■Claymore (x5): Level 2 & Costs $1,000
■C4 (x5): Level 3 & $1,500
■RPG-7 (x2): Level 27 & Costs $2,000
■Body Armor: Level 10 & Costs $2,000
■Self Revive: Level 12 & Costs $4,000
■Sentry Gun: Level 17 & Costs $3,000
■Sentry Grenade Launcher: Level 31 & Costs $4,000
■Riot Shield: Level 37 & Costs $3,000