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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.
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EXCERPTSfromBASIC FIREARMSIDENTIFICATION 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 5 6 6 Rt Rt Rt Lt Direction of Rotation
RIGHT TWIST LEFT TWIST PRINCIPLES OF FIREARMS IDENTIFICATION: Class Characteristics Imparted to Fired Bullets
Examples of Fired Bullets Right Twist Left Twist
SOURCES of MARKS on CARTRIDGE CASES BREECHFACE SLIDE FIRING PIN EXTRACTOR EJECTOR
breechface Support Area for the Cartridge extractor SLIDE removed from a Semi-Automatic Pistol
Live Cartridge loaded from the Magazine Slide retracted extractor ejector
ejector mark firing pin impression Impact site EJECTOR MARK on an Extracted and Ejected Cartridge Case ejector 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 FIREARMandTOOLMARKIDENTIFICATION -end- Lucien C. Haag Criminalist Forensic Science Services, Inc. P.O. Box 5347 Carefree, AZ 85377 haagfssi@aol.com