There is a Remastered version here.

Ranged Trip

Legacy Content

Source Advanced Player's Guide pg. 269 2.0
This weapon can be used to Trip with the Athletics skill at a distance up to the weapon's first range increment. The skill check takes a –2 circumstance penalty. You can add the weapon's item bonus to attack rolls as a bonus to the check. As with using a melee weapon to trip, a ranged trip doesn't deal any damage when used to Trip. This trait usually appears only on a thrown weapon.