Improved Critical

The Improved critical feat doubles the threat range of a certain weapon type (thrown, ranged, bludgeoning, piercing or slashing). This feat can be taken multiple times, for different types of weapons (but not to extend the range of a previous feat).

Improved Critical does not stack with other effects that increase threat range, such as the Keen and Impact weapon enhancements.

Prerequisite: Base attack bonus of +8 or higher