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If I bought an AR upper that was gauged and headspaced, is there any reason why I would want to use a different bolt and carrier than one I already have in my other upper?
Why wouldn't you have two bolts if you have two uppers? I realize that some uppers are sold without the bolt and charging handle but it seems to me that moving two pins to change uppers is a lot easier than having to remove the bolt and charging handle too. Extended charging handles for applications with a scope might look a little goofy with an upper with the fixed carry handle.
If it is just a cost consideration maybe shop around some more.
ALMOST all bolts will work with all barrels, so it's trivially easy to get a pair of bolts that work with the same barrel. It's a good idea to check though, periodically.
the advantage of getting a matched set is added accuracy of having the bolt face trued up to the receiver extension/barrel. details, details
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