You can use firearms set on autofire.
Prerequisite(s): Exotic Weapon Proficiency (Simple Firearms).
BENEFIT
You can fire any firearm on autofire without penalty (provided, of course, that it has an autofire setting). In addition, you are familiarize with certain advanced firearm weaponry.
Normal: A character who uses firearms with which he or she is not proficient takes a –4 penalty on attack rolls.