Instead, you need tocomplete a match in DMZ mode and defeat an AI-controlled boss (The Chemist).
He then drops the M13B for you to collect and add to your loadout.
They drop the gun, you pick it up, you exit the DMZ, and voila!
Now you could equip the M13B at the Gunsmith, too.
We also have a guide to thebest loadouts in Warzone 2to help make your set-up as effective as possible.
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