The Marrow is a Weapon Blueprint available in Call of Duty: Modern Warfare 3 (2022) and Call of Duty: Warzone 2.
It is a blueprint variant of the base weapon FSS Hurricane, one of the SMGs featured in Call of Duty Modern Warfare 3.
The Marrow blueprint was released in MW3 and Warzone 2 as part of the Bundle The Bone Yard.
You can find all the attachments for the Modern Warfare 3 and Warzone 2 Marrow Blueprint listed below.
Here are the attachments for the Marrow Blueprint featured in Call of Duty: Modern Warfare 3 and Call of Duty: Warzone 2.
You can build your own Marrow weapon Blueprint by adding these attachments on a base in the Gunsmith menu.
To unlock the Marrow Blueprint in COD Modern Warfare 3 and Warzone 2 you need to purchase the Bundle The Bone Yard from the Store.