FIB allows the examiner to cut a preselected GSR particle to make it possible to view the core and determine interior morphology and character to use to identify the ammunition manufacturer. The researchers obtained the sample particles for each of the four ammunition types by exposing four separate, typical, collection stubs to the down-range environment of the 9 millimeter pistol. Scanning electron microscopy/EX analyzed representative particles elementally. Their locations were recorded for future examination by FIB. Some particles of all brands were solid on the inside; therefore, the interior morphology was not present in all the particles samples. However, the descriptions applied consistently and without exception to the particles from a particular manufacturer when morphology was present. Photographs and 7 references (Author abstract modified)