Hunter's Aim 
Feat 2ConcentrateRangerSource Core Rulebook pg. 172 2.0
When you focus on aiming, your attack becomes particularly accurate. Make a ranged weapon Strike against your hunted prey. On this Strike, you gain a +2 circumstance bonus to the attack roll and ignore your prey’s concealed condition.
Hunter's Aim Leads To...
Targeting ShotTraits
Concentrate: An action with this trait requires a degree of mental concentration and discipline.