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The following is the method that the ATF uses to measure the barrel length of an AR 15 or variant at the time of writing this article.First Things FirstWhen preparing to measure the length of an AR-15 barrel, prioritizing safety is paramount. First and foremost, ensure the firearm is completely unloaded, removing the magazine and clearing the chamber of any rounds. It's wise to double-check this to eliminate any potential risks.Opting for a clean, well-lit environment can enhance precision and s …