R-COM S4 Attachment Guide
The R-COM S4 attachment in Call of Duty: Modern Warfare 2 and Warzone 2 is Weapons Platform Specific. In other words, this weapon stock is exclusive to a particular family of weapons.
How to Get the R-COM S4
To unlock the R-COM S4 attachment in Call of Duty: Warzone 2.0, you need to upgrade the ISO Hemlock to Level 11.