The Letter Opener 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 Combat Knife, one of the Melee Weapons featured in Call of Duty Modern Warfare 3.
You can find all the attachments for the Modern Warfare 3 and Warzone 2 Letter Opener Blueprint listed below.
Here are the attachments for the Letter Opener Blueprint featured in Call of Duty: Modern Warfare 3 and Call of Duty: Warzone 2.
You can build your own Letter Opener weapon Blueprint by adding these attachments on a base in the Gunsmith menu.
To unlock the Letter Opener Blueprint in COD Modern Warfare 3 and Warzone 2 you need to reach Sector A2 of the Season 1 Battle Pass.