MW4 DMZ key · Chang-san Air Base
Weapons Mod Workshop Key Location in MW4 DMZ
The Weapons Mod Workshop Key opens a weapons workshop at Chang-san Air Base. Its description names grid B5, at Chang-san Air Base.
Last updated Game version: DMZ Early Access, day 3
Where the Weapons Mod Workshop is
| Location | Chang-san Air Base |
| Tac-Map grid | B5 |
| Highest threat at Chang-san Air Base | Extreme |
The Tac-Map grid runs letters from west to east and numbers from north to south, so B5 is column B, row 5. See Chang-san Air Base on the interactive Hajin map, and its threat level by area in our Chang-san Air Base location guide.
What the Weapons Mod Workshop Key opens
A weapons workshop at Chang-san Air Base.
Confirmed by 2 sources, including video 1 at 0:19. Checked 2026-10-22 (DMZ Early Access, day 3).
How to get the Weapons Mod Workshop Key
No video we checked shows where this key drops yet. Keys turn up as loot, a Lieutenant you kill may drop the key to their own loot room, and some Story Missions pay keys as rewards. We add the drop here once two players show it.
Keys can go in your Stash between deployments, but anything outside a Secure Slot is lost if your exfil fails. Tick the keys you have in the MW4 DMZ key finder; the list stays in your browser.
Other keys at Chang-san Air Base
- Supreme Leader's Bunker Access Card: The Supreme Leader's Bunker, deep in the Chang-san Air Base Bunker.
- Airbase Armory Keycard - Single Use (grid B5): The armory in the Chang-san Air Base Bunker, whose door reads "Requires Air Base Armory Access Card". The card says it works once.
- Air Base DRC Weapons Locker (grid B6): The DRC Weapons Locker in the secure armory deep in the air base's bunker. One source so far, not yet verified.
Questions
Where is the Weapons Mod Workshop Key used in MW4 DMZ?
At Chang-san Air Base, grid B5 on the Tac-Map. It opens a weapons workshop at Chang-san Air Base.
Every confirmed MW4 DMZ key with its own page
- Counting Room Vault
- Mirae Electrical Room
- Shop Records Room
- Reactor DRC Locker
- Coin Mining Den
- Supreme Leader's Bunker Access Card
- Roze's Highrise Armory
- Vault Armory
- The Citadel South Wing
- Old Barber Shop
- Rail Depot Storage
- Militia Arms Depot
- Haksan School Armory
- Re-Education Center Annex
- Imjin Mill Foreman's Office
- Iskra's Control Room
- Netshin IT Room
- Police Weapon Depository
- The Chemist's Secure Armory
- Gangbyeon Apartment B
- Airbase Armory Keycard - Single Use
- Hanex Guard Station
- Lucera Suite 703 Bedroom
- Reactor 02 Control Room
- Weapons Mod Workshop
- Executive Arms Auction
- Hazard Storehouse
Sources
- Call of Duty Blog: DMZ Deep Dive Part 1, Hajin environments and threats (October 5, 2026): how keys work
- Call of Duty Blog: Ready for Launch, Modern Warfare 4 Progression and Prestige (October 19, 2026)
Checked against the official posts on October 22, 2026. The key itself comes from players’ videos, linked above at the moment they show it; we only give a key its own page once two different sources agree.
Continue reading
Next stepGot this key? Tick it off and find the next one in the key finder.MW4 DMZ Keys: Locations and Locked RoomsEvery confirmed DMZ key: where it is, its Tac-Map grid square, which door it opens and what players found inside.Go there Related guides
EnemiesDMZ Threat Levels, Enemies and BossesThe five threat levels, every enemy type named so far, the Lieutenants and Commanders on the Boss Board, and which places start at Extreme.
Getting startedDMZ Beginner's Guide: FOB and First RunsHow a DMZ deployment works from infil to exfil, which FOB stations open at which level, and what happens when you die.
VehiclesMW4 DMZ Vehicles: List and Aston Martin DreadnoughtEvery vehicle Activision has named for Hajin, what each Paid Infil costs, where to refuel and repair, and the Aston Martin Dreadnought.
Card pictures: Screenshot: Call of Duty: Modern Warfare 4 © Activision (enhanced)