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

Phalanx Breaker

FEAT 6
Activity 2 actions
Prerequisites Way of the Vanguard

Requirements You're wielding a two-handed firearm or a two-handed crossbow.

You know that to take out an enemy formation, you must punch a hole through its center. Make a ranged Strike with the required weapon against a target within the weapon's first range increment. The target is pushed directly back 10 feet (20 feet on a critical hit), and if this pushes the target into an obstacle, the target takes bludgeoning damage equal to half your level.

Pathfinder Guns & GearsORC