Is Circle of Protection's reflection effect based on luck?

Is Circle of Protection's reflection effect based on luck? - From below of glass round dome of house with sparkling lights against dark sky

Every source I've found says that the Circle of Protection gives "a chance" to reflect the bullets it touches. Is that a flat chance or is it luck-based? If it's the latter, what's the amount of luck required to get a 100% reflection chance?






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Is Circle of Protection's reflection effect based on luck? - Droplet creating splash in dark liquid
Is Circle of Protection's reflection effect based on luck? - Splashing drop of water in light
Is Circle of Protection's reflection effect based on luck? - Background of macro drop falling into dark liquid and forming circle and bubbles on surface





Pillars of Eternity: Circle of Protection




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