Whether it’s with a bullet from a sling, a quarrel from a crossbow, or even an expertly thrown dagger, the sniper ensures that a single shot disables his targets.
At 1st level, a sniper halves all range increment penalties when making ranged attacks with a bow, crossbow, or firearm.
This ability replaces track.
At 2nd level, when the sniper makes an attack against a target who is within his weapon’s first range increment and completely unaware of his presence, that attack ignores the 30 foot range limit on ranged sneak attacks, and if it is a sneak attack, he adds his sniper level as a bonus on his sneak attack damage roll. After this first attack, the target is aware of the sniper’s presence.