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Arcanist Buckler Speciality (3.5e Feat)
From D&D Wiki
Arcanist Buckler Speciality [General]
Sometimes even one point of AC can mean life or death
Prerequisite: any Arcane class
Benefit: You gain proficency with bucklers. In addition, you can ignore the 5% arcane spell failure chance while using bucklers. If you have more than one arcane spellcasting class, they all gain this benefit. If you have levels in the Spellsword Prestige Class, this reduction applies before your Ignore Spell Failure class feature does.
Normal: Most Arcanists suffer a 5% Arcane Spell failure chance while using bucklers.
Special: Arcanist Buckler Speciality can be selected as a fighter bonus feat. However, unless they are a multiclass character (or gestalt) then this feat is of no practical use to them.