Sword and Pistol (Combat)Source Ultimate Combat pg. 122 You effortlessly pair melee and ranged weaponry.
  Prerequisites: Dex 13, Point-Blank Shot, Rapid Shot, Snap Shot, Two-Weapon Fighting, base attack bonus +6.
  Benefit:  When you use the Two-Weapon Fighting feat while wielding a melee weapon and a crossbow or firearm, your attacks with the crossbow or firearm provoke no attacks of opportunity from foes that you threaten with your melee weapon.
  Normal:  Making a ranged attack provokes attacks of opportunity.Source Pathfinder Unchained pg. 133 When you use the Two-Weapon Fighting feat while wielding a melee weapon and a crossbow or firearm, as long as you have 1 stamina point in your stamina pool, you gain a +1 bonus on all attack rolls made with the crossbow or firearm.
         |