Who ever said that stainless guns won't rust?
Not sure about frames, but 1911 stainless barrels are 400 series, if I remember right... which as you say happily sticks to a magnet and is not all that stainless.
The good news is that, as others have said, these marks clean up easily. On my stainless Para (the frame and slide of which will cling on to a big speaker magnet strongly enough for foul language to be required during separation), I found many such marks early on. More recently, I'm being very generous with CLP under the grips (they're plastic) and they haven't reappeared.
But when they DID appear, an oily fingernail was all it took to remove them.
Too many people miss the silver lining because they're expecting gold.
M. Setter
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