How to get the M13B 'Health Hazard' Weapon Blueprint in DMZ - Call of Duty: Modern Warfare 2

However, it isn't as easy as walking in, eliminating a bunch of AI bots, and running away with the weapon. To get the weapon, you must defeat a stronghold boss called 'The Chemist' residing in this region.

The first thing you must do when you get to the region is eliminate one of the soldiers inside the radiation zone. The enemies inside the zone will drop a gas mask upon elimination.

The Chemist can be anywhere inside the yellow circle, however, you can identify the Chemist by his yellow hazmat suit.

The Chemist will be well-guarded by other heavily-armored soldiers. The Chemist himself is heavily-armored and will need a number of rounds to go down. It is understood that other players might also be looking for the Chemist. So you might be wondering, how do you know whether the Chemist is still alive or not? It is simple. When you enter the radiation zone, you get an on-screen notification that the Chemist is nearby.

It can get a bit difficult to see and fight the Chemist as he may constantly throw down smoke bombs and escape.

No need to panic here. Just stay in cover and eliminate the soldiers before you finally empty your rounds into the Chemist. Or, if you're not interested in a heroic gunfight, you can always use a vehicle to run over the Chemist to take him down instantly. The choice is yours.

Once the Chemist is down, he will drop the M13B blueprint.

As soon as you get the weapon, start making your way to the Exfil point.

Go to the Exfil site, call in a helicopter, and wait until it arrives. You might run into some AI bots trying to stop you. Try to hold them off until the chopper shows up. Once the chopper gets there, a 35 seconds timer will start.

Once you and all your teammates enter the back of the chopper, the timer will instantly reduce to 5 seconds. Once the timer ends with all the players in the back of the chopper, you will successfully exfil with the M13B weapon blueprint. You can then access the M13B in both Multiplayer and Warzone 2.0.

You must be holding the weapon in your hand while you exfil, as the weapon only gets unlocked for the player holding the weapon. You can use this mechanic to help your friends unlock the weapon. There is a simple trick that you can try with your friends.

You must equip the M13B contraband for this trick in your next DMZ run with your friend. Once you've loaded in, drop the weapon for your friend and let them equip it.

Now Exfil with your friend, and they will also unlock the weapon for their Multiplayer and Warzone 2.0. Since you dropped the contraband, it won't be available anymore in your DMZ loadout. It will now be available for your friend. If you want the contraband, you must either ask it back from your friend or eliminate another Chemist.