EXCERPTS from BASIC FIREARMS IDENTIFICATION Lucien C Haag
EXCERPTS from BASIC FIREARMS IDENTIFICATION Lucien C. Haag Criminalist Forensic Science Services, Inc. Carefree, AZ 85377 haagfssi@aol. com Prepared for DCA Vince Imbordino
PRINCIPLES OF FIREARMS IDENTIFICATION CALIBER DESIGNATIONS Caliber relates to the nominal inside dimensions of the barrel
PRINCIPLES OF FIREARMS IDENTIFICATION FOUR COMMON RIFLING ARRANGEMENTS 4 Rt 5 Rt 6 Rt Direction of Rotation 6 Lt
PRINCIPLES OF FIREARMS IDENTIFICATION: Class Characteristics Imparted to Fired Bullets RIGHT TWIST LEFT TWIST
Examples of Fired Bullets Right Twist Left Twist
SOURCES of MARKS on CARTRIDGE CASES SLI DE CE BREECHFA FIRING PIN EXTRACTOR EJECTOR
breechface Support Area for the Cartridge extractor SLIDE removed from a Semi-Automatic Pistol
Live Cartridge loaded from the Magazine Sli de re tra cte d extractor ejector
EJECTOR MARK on an Extracted and Ejected Cartridge Case ejector mark firing pin impression ejector Impact site Typical ejectors are located at the 7 to 8 o’clock position
CARTRIDGE CASE EJECTION from a SEMI-AUTOMATIC PISTOL barrel Ejector slide
STYLIZED BREECHFACES with VARIOUS TOOL MARKS FIRED CARTRIDGES
STYLIZED BREECHFACES and VARIOUS EJECTOR SHAPES FIRED CARTRIDGES with EJECTOR MARKS
Summary of Markings on Cartridge Cases
BASIC FIREARM and TOOLMARK IDENTIFICATION -end. Lucien C. Haag Criminalist Forensic Science Services, Inc. P. O. Box 5347 Carefree, AZ 85377 haagfssi@aol. com
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