Such changes could be made and the possibility should be kept in mind. Many firing pins have definite identifying characteristics which can be removed very easily by filing or by a little work with an emery cloth. Here again a bright surface would be suspicious but the brightness can be very easily removed. If one had to depend wholly on firing pin impressions this might be a useful technique for the criminal, but, fortunately, we usually have other markings on a fired shell which are even better than the firing pin impression.
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