The bonuses for Musket Training for the Musket Master and Pistol Training for the Pistolero (pfuc_abilities_archetypes.lst) are currently missing. The Musket Master should get DEX at fifth level, plus one for every 4 levels after that, on two handed firearms, and the Pistolero should get the exact same bonus but on one handed firearms. Adding these BONUSes to the respective abilities should fix it:
Musket Training ~ MUSKET MASTER
BONUS:WEAPONPROF=TYPE.TwoHandedFireArm|DAMAGE|DEX+max(0,(GunslingerLvl-5)/4)
Pistol Training ~ PISTOLERO
BONUS:WEAPONPROF=TYPE.OneHandedFireArm|DAMAGE|DEX+max(0,(GunslingerLvl-5)/4)
Completed: At revision: 19905-6