Installed

Some shields aren't held but are installed as armor or weapon upgrades. You can Raise a Shield installed as an armor upgrade as normal. Shields can be installed only into weapons with the parry trait. When you use a parry weapon with a shield upgrade to get a bonus to your AC, the shield upgrade emits an inertial dampening barrier and you automatically Raise a Shield. If you use the weapon for any other purpose, the shield is no longer raised, and you no longer receive a bonus to your AC. You can't Raise a Shield installed as an upgrade in any other way.