How to unlock the Mutagen SMG blueprint in MW3 and Warzone

For all of its pricy bundles that it gets flak for, Call of Duty is actually pretty generous with free loot to unlock.

The latest free piece of loot is a unique SMG blueprint that can be acquired in just a few games in the final week of season four of Modern Warfare 3 and Warzone. The challenges are simple but the gun is beautiful, and we have all the info you need on how to get it.

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