How to Unlock M13B Assault Rifle in Warzone 2.0 for Free

Season 1 of Warzone 2.0 and Modern Warfare 2 includes four new weapons to unlock, including the M13B assault rifle.

The new assault rifle is part of the Bruen Ops platform, alongside the new BAS-P SMG and Chimera assault rifle arriving mid-season. It features a high rate of fire and low recoil, in addition to its own set of basic camos that can be used for all weapons in the game.

The good news is that the M13B is free to unlock, but comes with a specific DMZ Exfiltration Mode challenge.

Here’s how to unlock the M13B assault rifle.



How to defeat the Chemist in DMZ and unlock the M13B assault rifle

Screenshot by Koh Wanzi/ONE Esports

The M13B is unlocked by defeating the Chemist in the DMZ radiation zone and taking out his dropped weapon.

The radiation zone is marked by a yellow circle on the Tac map (press “M”), complete with an ionizing radiation hazard symbol.

This is a PvE boss fight that’s actually quite challenging, and you’ll probably want to tackle it as a full team of three. You will also need to purchase gas masks for your team before starting combat, as the radiation zone will damage your team over time.

Gas masks can be found as ground loot in the DMZ, but they are quite rare. Alternatively, they can be purchased for $2,000 from a Buy Station.

Once you have the gas mask, you can get it from the DMZ or go to the pharmacy. The safer option is to exfiltrate first so you can add the mask to your stash and return it later. If you die, you lose the mask and have to start all over again.

You also need to be the first squad to beat the Chemist, which means another team might already be ahead of you depending on how long it took you to secure the masks.

Call of Duty Modern Warfare 2 DMZ Exfil
Screenshot by Koh Wanzi/ONE Esports

Exfil locations are marked by a blue exit icon, which resembles a figure running towards a door. A helicopter will then arrive to take you away. Keep in mind, though, that the helicopter won’t leave until the countdown timer runs out, and AI soldiers will try to prevent you from getting out.

The second time you go to the DMZ, you can go straight to the pharmacy with your gas mask and primary weapon insured. We recommend finding a vehicle and driving to the danger zone to get there as quickly as possible.

The chemist can be identified by the yellow safety suit he wears – if you drove there, running him over with the vehicle is also one of the quickest ways to take him down. Once you defeat him, he will drop the M13B blueprint.

Call of Duty Modern Warfare 2 Warzone 2 DMZ Chemist
Credit: The Gaming Merchant

Only the player holding the blueprint receives the weapon, so only one player can take out and unlock the weapon with the M13B.

But if you already have a friend who has unlocked the weapon, you’re in luck. All you have to do is load into the DMZ, drop them the weapon, then exfil while holding it. Alternatively, you can also pick up the weapon from enemy players.

There is currently no path to unlocking the M13B in multiplayer or Warzone 2.0. That may change in the future, but the DMZ is your only route for now.

Learn about the best weapons to level up for Warzone 2.0, the new Gulag, and the best muzzle mounts to use.

READ MORE: What is DMZ? Warzone’s new mode detailed

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