When the gunmarshal makes a critical hit with a firearm, the target must succeed at a DC 18 Fortitude save or be <a href="/condition/stunned">Stunned 1</a>.

Firearms Critical Specialization

The gunmarshal marks a foe for judgment, granting the gunmarshal a +10-foot circumstance bonus to Speed when moving toward that creature.

Lawbringer

When the gunmarshal makes a critical hit with a firearm, the target must succeed at a @Check[fortitude|dc:18] save or be @UUID[Compendium.pf2e.conditionitems.Item.Stunned]{Stunned 1}.

Gunmarshal