Call of Duty Wiki
Call of Duty Wiki
The subject of this article appears in Call of Duty: Modern Warfare (2019)
For a similarly named attachment, see XRK SA87 Heavy Stock Pro.
"Heavy weight stock attachment provides stability while aiming."
— Description

The FSS Heavy Stock Pro is an attachment featured in Call of Duty: Modern Warfare. It is available to the AUG and P90 bullpup submachine guns.