Pistolero, Grand Master (D20 Modern Feat)
From D&D Wiki
Pistolero, Grand Master
Prerequisite: Dex 13+, Personal Firearms Proficiency, base attack bonus +12, Pistolero, Master
Benefit: You are an exceptionally skilled pistolero. Every shot you make is reliably aimed at the center mass or head of your victim. You inflict an additional +1 damage with ranged pistol or revolver attacks (+3 total) when you hold your pistol or revolver in two hands.
Special: This bonus damage does not stack with the Weapon Specialization class feature.