"Weapon blueprints" refer to detailed diagrams or plans that show how to build or create weapons.
Full definition
The crafting system is simple enough, you must have a blueprint, the weapon or group
of weapons the blueprint calls for, and the items that are used for the modification.
GameStop: «Guerilla Care Package: Five Resistance Crates full of
random weapon blueprints, attachments, equipment, and more.»
There will also be R&D rewards for players who
bring weapon blueprints and appropriate resources to Chokufunsha in the Waiting Room and tripled Premium Decal rates when players make purchases at the Mushroom Club.
New weapon blueprints are found all over the two environments, and the thrill of researching a new grenade launcher and having it instantly dropped into the battlefield is a similar joy you'd get from an RPG crafting system.
Then, go to the North Pole Town Square Workshop in Central Plaza, and use Analyzer mode on the bookcase to find
the weapon blueprint inside the Panic Room.
In this case, that DLC includes the «Ryder White» expansion, the «Bloodbath Arena» high score mode, and
a weapon blueprint for «The Ripper.»