http://www.dandwiki.com/wiki/Zen_Arc...%29#Power_Shot
...Ki Shot: At 4th level, the zen archer learns to channel the subtle energies of ki through his ranged attacks made with bows. The zen archer may now add his Wisdom bonus to damage rolls made regarding bow attacks. This added damage stacks with bonuses gained from using composite bows with a strength requirement. Zen archery and its subsequent special abilities can only be used with shortbows and longbows (not crossbows or other ranged or thrown weapons). Added damage from Zen Archery cannot drop below 0. ...
...Though a zen archer casts no spells, he channels a subtle energy called ki, which allows him to empower his shots. A zen archer also has a preternatural awareness that allows him to dodge an attack even if she is not consciously aware of it. As a zen archer gains experience and power, his mundane and ki-oriented abilities grow, giving him more and more power over himself and sometimes over others...
...A zen archer channels his ki through his arrows...
...Bonus Feat: A zen archer gains a number of bonus feats as he improves. He gains one at 1st, 2nd, 6th, 10th, 15th and 20th. He may choose any of the following: Deflect Arrows, Far Shot, Improved Precise Shot, Manyshot, Mounted Archery, Point Blank Shot, Precise Shot, Rapid Shot, Shot on the Run and Snatch Arrows. When choosing bonus feats, the zen archer may apply his Wisdom score to any prerequisite usually involving Dexterity. For instance, he may apply for the Manyshot feat if he has a Wisdom score of 17....
...Zen Mastery: At 16th level, a zen archer's mastery over his weapons of choice increases. The critical multiplier of any shortbow or longbow in his hands increases by one and becomes ×4.... <-----
Wow this is better than Deep wood sniper!