the only difference with the primer is the nato rounds primer is crimped! now a M14 is a military rifle I'm guessing your talking about a M1A and its headspaced for both, and they do have a full auto model. BTW can you show me a Youtube video of this or an actual case of a M14 or M1A going full auto when its semi auto with a Nato round? because if this does happen (which I'm not saying its not possible) thousands of people with springfield M1A's need to be made aware.
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