Lots of factors to consider in my opinion. Firing schedule, rate of fire, and lubrication.
I have a BCM bolt that has about 10K on it and at least 40% of those rounds were suppressed.
I also keep my weapon lubed very wet and I don't do silly magazine dumps. Thus far I have only replaced the ejector spring. The gas rings and extractor spring are original.
As for carriers the failures usually are attributed to faulty staking of the carrier key. Also getting primers or anvils inside the carrier key and being unable to remove them which will require re-keying.


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