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Some advice I got from members when I posted a similar thread:

Extractor
Firing Pin Spring
Gas Piston
Gas Piston Rings

I keep spares for a rebuild just in case I want to return it to a safe queen.
I keep a complete bolt, rings, piston, firing pin. I've only seen a broken extractor on a training carbine & it was a DI. YMMV.
 
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