There hasn't been any real problems withe gun.
Given that:
1) recoil spring(s)
2) extra-strength extractor spring (from Wolff)
3) 5% extra-strength mag springs (from Wolff)
4) Trigger return spring.
5) Trigger pin
You can get some of this from Jim Miossi, and he has other pins, etc. He recommends roll pins, I think. I prefer them, too.
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The loaded chamber indicator has been known to go "walkabout" on a few guns, and a spare part or two there MIGHT be worthwhile.