From Pathfinder Guns & Gears, which isn't enabled.

Magnifying Scope

ITEM 3

Price 70 gp

Usage attached to crossbow or firearm scope

Bulk L

These scopes use magically enhanced lenses to extend the range of your weapon and help spot distant foes. The scope grants you a +1 item bonus to visual Perception checks to Seek creatures through the scope.

Activate—Zoom In (manipulate)

Effect You zoom in on your targets to make it easier to hit them at a distance. You increase the range increment of the weapon to which the scope is attached by 5 feet until the beginning of your next turn or until you're no longer wielding the weapon, whichever comes first.

Pathfinder Guns & GearsORC