pf2e.fyi
From Pathfinder Guns & Gears, which isn't enabled.

Advanced Shooting

FEAT 6
ARCHETYPE
Archetype Gunslinger
Prerequisites Basic Shooting

You gain one gunslinger feat. For the purpose of meeting its prerequisites, your gunslinger level is equal to half your level.

Special You can select this feat more than once. Each time you select it, you gain another gunslinger feat.
Pathfinder Guns & GearsORC