Shielded Gauntlet Master (Combat)Source Armor Master's Handbook pg. 12
Your can effectively attack and defend with your gauntlet.
Prerequisites: Shielded Gauntlet Attack, Shield Gauntlet Style, Weapon Focus (gauntlet or spiked gauntlet), proficiency with bucklers and light shields.
Benefit: While using Shield Gauntlet Style, you no longer lose your shield bonus to AC when you attack with your gauntlet (or spiked gauntlet) or use it to hold a weapon. In addition, you add your gauntlet’s enhancement bonus to the shield bonus to AC granted by this feat as if it were a shield enhancement bonus.