You can improve your arcane ammunition with more powerful magic.
Benefit(s): While your gun is imbued with power from the Arcane Strike feat, you can spend a standard action to cast a spell of 3rd level or lower and deliver it via a force bullet. The spell must have a range of touch or produce a ray; if the spell would produce multiple rays, the bullet delivers the effect of only one ray. If the force bullet strikes a target, it deals its force damage and also delivers the effects of the spell. If the force bullet critically hits a target, the spell deals double damage.
Pathfinder Player Companion: Heroes of Golarion © 2019, Paizo Inc.; Authors: Saif Ansari, Alexander Augunas, Mara Lynn Butler, Michelle Jones, Avi Kool, and Alex Riggs.