Exotic Firearms Proficiency

Choose a weapon type from the following list: cannons, heavy machine guns, grenade launchers, rocket launchers, or any advanced weapon that counts as exotic under the conditions listed below.
Prerequisites: Personal Firearms Proficiency, Advanced Firearms Proficiency.
Benefit: The character makes attack rolls with the weapon normally.
Normal: A character who uses a weapon without being proficient with it takes a –4 penalty on attack rolls.
Special: Weapons in the advanced categories count as exotic weapons for purposes of proficiency, unless the character belongs to a community with the engineering feat required to make that sort of weapon (see Community Feats) or the character has the required Tech Familiarity feat. In that case, the weapon belongs to the same category as compatible weapons requiring less sophisticated technology—simple weapons, personal firearms, and so on. A character who learns to use an advanced weapon with the exotic proficiencies does not have to acquire the general lore required for tech familiarity first.
A character can gain this feat multiple times. Each time a character takes the feat, she selects a different weapon group.