AFTE Store - Computer Numerical Control (CNC) Production Tooling and Repeatable Characteristics on Ten Remington Model 870 Production Run Breech Bolts

Comparisons were made to determine if the Computer Numerical Controlled (CNC) process used to manufacture shotgun breech bolts would produce sufficient Subclass Characteristics on the bolt faces to be attributable to the working surfaces of the tool groups used within a single Production Run. Of additional interest was if these characteristics could be traced through an entire CNC Production Run leaving the sufficient transfer of individual markings to be considered unique in nature.