Sublime Marksmanship (3.5e Maneuver)

Not all gunslingers are bloodthirsty murderers or ruthless vigilantes. Most see the value of ending a fight without fatally wounding a foe, and have thus honed their skills to shoot an enemy’s weapons out of his hands.

For one round, you may disarm foes or sunder weapons with ranged attacks (even if they are not made with firearms) without the usual penalty for doing so.