You can make exceptionally deadly ranged attacks by pinpointing a foe’s weak spot, at the expense of making the attack less likely to succeed.
Prerequisites
Dexterity 13, base attack bonus +1.
Benefit
On your action, before making attack rolls for a round, you may choose to subtract a number from all ranged attack rolls and add the same number to all ranged weapon damage rolls. This number may not exceed your base attack bonus. The penalty on attacks and bonus on damage apply until your next turn.