KAS-1 381mm Attachment Guide
The KAS-1 381mm attachment in Call of Duty: Modern Warfare 2 and Warzone 2 is Weapons Platform Specific. In other words, this weapon barrel is exclusive to a particular family of weapons.
How to Get the KAS-1 381mm
To unlock the KAS-1 381mm attachment in Call of Duty: Warzone 2.0, you need to upgrade the Vaznev-9K to Level 14.