Weapon Blueprints are a style of Weapon Variants introduced in Call of Duty: Modern Warfare and making appearances in Call of Duty: Mobile and Call of Duty: Black Ops Cold War. Weapon Blueprints offer a unique skin with attachments unlocked for the respective weapon, regardless of the Weapon Level that the player has for the weapon. Often these attachments are also skinned in the same style.
Weapon Blueprints can be earned via multiple means, such as progression in Battle Pass, purchasing or earning of "Bundles" that include them and earning them via in-game events. Blueprints are also designated by rarities, being Rare, Epic and Legendary with Call of Duty: Black Ops Cold War Season One updates bringing the return of the Mastercraft Variant as a new tier of Blueprint under name of Ultra.