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5.56 x 45 mm NATO
5.56 mm chambering, known as a NATO or mil-spec chambers, have a longer excessive lead.[2] Using 5.56 mil-spec cartridges (such as the M855) in a .223
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5.56 mm chambering, known as a NATO or mil-spec chambers, have a longer excessive lead.[2] Using 5.56 mil-spec cartridges (such as the M855) in a .223
