PHB2 has deadeye shot, though it is fairly tricky to use effectively (you ready a ranged attack, and if you fire at the same time an ally successfully hits the target, it loses its dex against your ranged attack).
PHB2 has deadeye shot, though it is fairly tricky to use effectively (you ready a ranged attack, and if you fire at the same time an ally successfully hits the target, it loses its dex against your ranged attack).