AFTE Store - Use of a Breechface Toolmark To Identify Fired Cartridge Cases to a S&W Sigma SW40V

A Smith & Wesson Sigma SW40V in an inoperable condition was submitted for examination along with fired cartridge cases and bullets. Identification of evidence cartridge cases was made by using a toolmark of the breechface, duplicating the striated shear marks found on ejected cartridge cases.