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how does an AR barrel not get screwed from rapid fire?
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Well, heat is heat and an AR barrel will wear out faster if you fire it rapidly. However, ARs typically have more metal to heat up, so the heat is dissipated a little more. Also, ARs typically aren't expected to shoot as accurately as a bolt rifle (unless you have a HBAR, then it probably is) so it's not quite as big of a deal.