I have 8 DSA SA58 FAL mags that have surface rust on them.
Some are better than those in the pic, some are worse. Rust is on the surface and can likely be fixed with some elbow grease, re-finished, or just paint over it. The finish on these doesn't look very strong, hence the surface rust. I bought replacements and don't want to mess with it. Buy them for less than you can find any good FAL mag.
All 8 for $120. Can meet in Central Dallas or Rockwall.