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EXCERPTS from BASIC FIREARMS IDENTIFICATION

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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EXCERPTS from BASIC FIREARMS IDENTIFICATION

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  1. EXCERPTSfromBASIC FIREARMSIDENTIFICATION Lucien C. Haag Criminalist Forensic Science Services, Inc. Carefree, AZ 85377 haagfssi@aol.com Prepared for DCA Vince Imbordino

  2. PRINCIPLES OF FIREARMS IDENTIFICATION CALIBER DESIGNATIONS Caliber relates to the nominal inside dimensions of the barrel

  3. PRINCIPLES OF FIREARMS IDENTIFICATION FOUR COMMON RIFLING ARRANGEMENTS 4 5 6 6 Rt Rt Rt Lt Direction of Rotation

  4. RIGHT TWIST LEFT TWIST PRINCIPLES OF FIREARMS IDENTIFICATION: Class Characteristics Imparted to Fired Bullets

  5. Examples of Fired Bullets Right Twist Left Twist

  6. SOURCES of MARKS on CARTRIDGE CASES BREECHFACE SLIDE FIRING PIN EXTRACTOR EJECTOR

  7. breechface Support Area for the Cartridge extractor SLIDE removed from a Semi-Automatic Pistol

  8. Live Cartridge loaded from the Magazine Slide retracted extractor ejector

  9. 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

  10. CARTRIDGE CASE EJECTION from a SEMI-AUTOMATIC PISTOL barrel Ejector slide

  11. STYLIZED BREECHFACES with VARIOUS TOOL MARKS FIRED CARTRIDGES

  12. STYLIZED BREECHFACES and VARIOUS EJECTOR SHAPES FIRED CARTRIDGES with EJECTOR MARKS

  13. Summary of Markings on Cartridge Cases

  14. BASIC FIREARMandTOOLMARKIDENTIFICATION -end- Lucien C. Haag Criminalist Forensic Science Services, Inc. P.O. Box 5347 Carefree, AZ 85377 haagfssi@aol.com

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