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Why would you want to take your spare bolt and use it now? From your other thread, it doesn't look like you have any problems with your current bolt.
If you use your new bolt for 5,000 rounds, it becomes a used bolt. Add a new barrel later and you are essentially matching a used bolt to a new barrel. That's not recommended as they wear together. Anytime I get a new upper, I get a new bolt to "match" it.
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