The mixture may well remove rust, but that process did not magically just dissolve it for me. I have always had to use oil soaked bronze wool, and sometimes hard bristle toothbrush, to get the job done. The bronze wool should not remove the bluing, but will cut the rust. Make sure you keep the gun protected with wax and/or oil and no further damage should occur. What were your stocks made of?

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Gary
SWCA 2515