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A&D – Different Calibers Marked on Receiver and Barrel

posted on January 18, 2019

Q: On the receiver of the Colt Expanse rifle, the caliber is listed as “5.56MM” but on the barrel the caliber is listed as “5.56 NATO”. When logging on A&D and 4473, which caliber should be listed? Should we use the more specific one (5.56 NATO) or the one stamped on the lower receiver (5.56MM)?

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