AFTE Store - Consecutively Machined Ruger Bolt Faces

Six consecutively machined Ruger rifle bolts were examined for individual and subclass characteristics resulting from the end mill machining process. Comparisons revealed a startlingly high correspondence of microscopic characteristics among the bolt faces examined. This high level of correspondance resulting from a milling operation recalls previous cautions concerning subclass microscopic “matching”. Further examination of these bolts revealed slight individual irregularities such as abrasions and chatter marks. These microscopic flaws differ between the consecutively machined bolts and could be used for identification of these bolt faces if they transfer to a cartridge case.