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If you want to see a barrel with "smiles" on it, you should see mine...lol. Your barrel is fine. That is minimal wear. It will, in fact, wear more than that with use. I agree it's probably in the 1-2K rounds.

I have the Mec-gar 15 round mags for my P226 as well as the Sig factory mags (I read somewhere that Mec-gar makes the Sig factor mags as well). I never bothered to pull the springs, but I assume mine are the same. All of my Sig mags function flawlessly. If it works, don't mess with it.

ETA: The 15 round mags have an extended base plate. They are physically longer than the 10 round mags. This would require a longer spring.