Most abilities in the Kensei tree have a melee and ranged counterpart.
Requesting adding Opportunity Attack: 2 Charges. Ranged Attack: Deals +3[W] Damage, consumes 1 charge. On Damage: You gain 20 Ranged Power for 6 seconds.
There is a 10% change to regain an expended charge of this enhancement anytime you hit an enemy.

Thanks!