In Call of Duty: Modern Warfare 4’s DMZ, the key grants access to green Weapons Lockers located in gun stores, not to one individual room, which sets it apart from the door keys in the DMZ key locations guide. The key card lists two locations where it can be used, so you can choose which one to visit.
Quick answer: Take the key to the gun store in Western Cheongun Village or Northern Songdo Wharf. Go to the back room and use it on a green locker at the “GUN STORE WEAPONS LOCKER – UNLOCK” prompt.
Gun Store Weapons Locker key card details
Check the item card to confirm you have the right key. Its description reads: “Unlocks the Weapons Lockers in Gun Stores, found in Western Cheongun Village and Northern Songdo Wharf.”
- Name: “GUN STORE WEAPONS LOCKER”
- Rarity: RARE
- Type: KEY
- Value: 100
- Can sit in a SECURE SLOT, so you keep it if you lose your backpack
Gun store locations for the Weapons Locker key
Both gun stores on the key’s card are in areas the HUD marks as low threat (see the Hajin points of interest for the rest of the map). Each has the same row of tall green lockers in a back room.
| Gun store | HUD area name | Threat |
|---|---|---|
| Northern Songdo Wharf | Songdo Wharf | LOW |
| Western Cheongun Village | Cheongun Village | LOW |
Northern Songdo Wharf gun store
Find a low commercial building beside a fuel station topped by a yellow canopy. Go in through the glass doors at the front; the lobby has an “INFORMATION” sign. Descend the stairs to reach the green-walled back room, where the lockers are.
Western Cheongun Village gun store
On the map, locate it around column E, row 4. Inside, you’ll find a shop counter, a poster featuring a cartoon mascot, and a stairwell leading to a back room with the same row of green lockers. If you don’t have the key, each locker displays “GUN STORE WEAPONS LOCKER – LOCKED”.
How to open a gun store Weapons Locker
The game confirms the unlock with 375 XP and a “DOOR UNLOCKED” message. You can then loot the WEAPONS LOCKER.
Opening a locker doesn’t unlock the others: the next one in that store continues to display “GUN STORE WEAPONS LOCKER – LOCKED”.
What a gun store Weapons Locker can hold
The locker uses a grid inventory. One opened locker held the items below. Treat the list as an example of what you can find, not a fixed loot table.
| Item | Type | Rarity | Value |
|---|---|---|---|
| KG-7 Vulcan | Sniper rifle | RARE | 4,300 |
| Cipher Code Ledger | Valuable | EPIC | 5000 |
| Control Unit | Item (x1) | — | — |
| Zip Gun | Item (x1) | — | — |
The same locker also held a second rifle and a few smaller items. The Cipher Code Ledger’s card says it “Can be extracted and sold in the FOB for cash.” That means a valuable like the ledger pays nothing until you extract with it and sell it at the FOB.
