Artillery Schematic

The artillery piece schematics is a world object in Fallout 4.

Gameplay
Finding those schematics allows the Sole Survivor to build artillery pieces at controlled settlements.

Once the schematics are picked up they will disappear from the world and will not appear in the Pip-Boy inventory.

Location
The artillery schematics are found in the armory of the Castle armory during the quest Old Guns.