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If indeed yours is an older model sig, some parts have been known to take on a purple hew. But I do not see anything wrong there. Looks about the same wear as a couple of mine have. I just use a little grease on the rails these days. Sig packs TW-25 with all their new pistols. So I guess that is what they recommend. I personally use a little bit of SLIDE GLIDE. Feels like the slide is on ball bearings.
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