Boomstick (D20 Modern Feat)
From D&D Wiki
You are a master of blasting away with a shotgun.
Prerequisite: Personal Firearms Proficiency, Point Blank Shot, base attack bonus +4.
Benefit: When you attack something with a shotgun within 30 feet, you inflict an additional +2 damage. This bonus applies to slugs as well as shot, but not to special ammunition such as dragon rounds.