Needs review
Source: Pathfinder: Advanced Player's Guide

Description: You can load crossbows with blinding speed and even fire them in melee with little fear of reprisal

Prerequisites: Point Blank Shot, Rapid Shot, DEX 15, Rapid Reload

The time required for you to reload any type of crossbow is reduced to a free action, regardless of the type of crossbow used. You can fire a crossbow as many times in a full attack action as you could attack if you were using a bow. Reloading a crossbow for the type of crossbow you chose when you took Rapid Reload no longer provokes attacks of opportunity.

Special

Starting at 6th level, a Ranger with the archery combat style may select Crossbow Mastery as a combat style feat.