How to unlock the Valuable Gun Screen in DMZ

The Koschei Complex in Call of Duty: Warzone DMZ features several discoverable secrets and rewards like the Heated Madness blueprint. The Shopkeeper in the Factory Admin section has a Secure Buy Station from where you can trade for special items that aren't available anywhere else, including the Valuable Gun Screen cosmetic.

The Valuable Gun Screen can be acquired from the Barter menu of the Secure Buy Station in exchange for three special items: