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A complete spare bolt is a good idea since it is easy to swap out and addresses several common issues (extractor, ejector, gas rings, broken lugs).
You can also buy a set of AR15 springs pretty cheap - they don’t break or wear out often but the little detent springs get mangled by inexperienced users swapping the stock, or launched into low orbit during obsessive detail cleaning. Plus that usually comes with a spare buffer spring, which is a wear part that will need to be replaced and impacts function.
Those two things will handle a lot of common AR issues at minimal expense and hassle.
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