DEEP WOODS SNIPER [Ranger, Archery]

     You become deadly at ranged combat when tracking a target and striking it with your bow
Prerequisite: Sniper class ability, Improved Critical (bow), Weapon Focus (bow), BAB +6.
Benefit: After taking a full-round action to observe a target, you can double the critical threat range of your bow for the next round, but only when attacking the target you previously observed. So a ranger with a long bow and Improved Critical would have a threat range of 17-20/x3.

     The target must be within the ranger’s sniper range.
Special: It takes a full-round action of just observing a target before the ranger gains the benefits of this feat.

     Attempting to use this feat in combat leaves you open to an attack of opportunity.  If you take damage while focusing on a target you must make a concentration check.  Failure means you do not gain the benefits of this feat in the next round.  You may make another attempt though.