From what little I understand about the technology (Dammit, Jim! I'm a lawyer, not a mettalurgist!), even a few hundred rounds will put enough wear on the end of the firing pin as to make the microstamp illegible.
(Metallurgists, please correct me if I'm wrong.)
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I'm a lawyer, but I'm not your lawyer. If you need some honest-to-goodness legal advice, go buy some.
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