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I tried some of the 31-round magazines made by KCI. They won't even hand-cycle rounds without the stack of rounds locking up leaving the top few rounds loose, and the feed lips were gouging the casings. When I saw that I didn't even bother to try them at the range.

I have a couple of 22-round .40 magazines made by Glock and they function perfectly in both my G23 and G27. If you want spare springs, they use the same 17-coil springs that the 9mm 31/33-round magazines use.
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