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  1. What is 15 in AR-15?

    Handgun Hunting and General Discussion
    According to several rumors, the AR-15 is known to be the 15th design by Eugene Stoner. Reportedly, the 15 in the name stood for the caliber size. But no! It was not. The AR-9 uses the 9 mm caliber. The 15 in the AR-15 denotes the caliber size. Jim Sullivan and Bob Fremont were two people who...