Many people love CS springs. Others strongly dislike them, claiming that rust is an issue. Rust is a big problem if it occurs on a spring due to the fact that the surface of the spring is what is doing a lot of the "springing". A rusty spring is much more compromised than say, a rusty slide, carrier, bolt, or whatever.
I pitted the Colt Mil-spec 17-7 spring against the Sprinco White CS Moly-plated spring. The "humidity cabinet" also goes by the name "Dishwasher". No soap was used, and it was placed on heated-dry and the springs left in until cycle completed.
I also pitted the Colt Mil-spec extractor spring against the SAW Ken Elmore "Green" extractor spring.
Absolutely NO rust was observed on the Ken Elmore extractor spring, or the Colt action spring, even when white paper-towels were roughly swabbed over their surfaces. The other two springs rusted very notably, as depicted. All springs were used in my carbine previously, so as to have removed any passivated/painted/washed type surface treatments, as one would find on the springs in their "new in wrapper" state which would not represent an item in-use.
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