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Greater Weapon Specialization (D20 Modern Feat)
From D&D Wiki
Greater Weapon Specialization (weapon)
Choose one type of weapon for which you have already selected Weapon Specialization. You can also choose unarmed strike or grapple as your weapon for purposes of this feat.
Prerequisite: Proficiency with selected weapon, Greater Weapon Focus with selected weapon, Weapon Focus with selected weapon, Weapon Specialization with selected weapon, armsman level 8th.
Benefit: You gain a +2 bonus on all damage rolls you make using the selected weapon. This bonus stacks with other bonuses on damage rolls, including Weapon Specialization (below).
Special: You can take Greater Weapon Specialization multiple times. Its effects do not stack. Each time you take the feat, it applies to a new type of weapon. An armsman may select Greater Weapon Specialization as one of his armsman bonus feats.