The 9mm Sub OP is a weapon attachment featured in Call of Duty: Modern Warfare 3 (2022) and Call of Duty: Warzone 2.
It is one of the Ammunition attachments available in MW3.
The 9mm Sub OP is a Universal Attachment, which means it can be used across all Weapons Platforms in the game.
Here's how to unlock the 9mm Sub OP attachments in COD Modern Warfare 3 and COD Warzone 2: Coming Soon.
Here you can find the list of Weapon Blueprints that include the 9mm Sub OP attachment in COD Modern Warfare 3 and COD Warzone 2: