CSI – Rifling Guided Reading Graphic Organizer Go to the www.FirearmsID.com website and read the information in the rifling, rifling impressions and general rifling characteristics sections and answer the questions below. Rifling 1. What is rifling? Rifling Patterns 6. How many lands and grooves are there in a rifling pattern? 2. Where do you find rifling in a firearm? 7. Which way does the bullet spiral (clockwise or counterclockwise) in a right spiral rifling pattern? 3. What does rifling do to a bullet? 8. What are the most common rifling patterns? 4. Why is rifling important? 9. What is the rifling pattern pictured below? 5. What are the two components of rifling? Write a definition for each one. Examining Rifling Patterns 10. Why is rifling important in ballistics? General Rifling Characteristics 12. What are the 4 general rifling characteristics examiners look to match between the standard and the evidence? 11. What are examiners looking for to make a positive match between a 13. What instrument do examiners use to take measurements? bullet and a specific firearm? 14. Were the two bullets below fired from the same gun? Explain your answer. Testing Procedure 16. Describe the testing process. 17. What do the examiners use as standards for comparison to the evidence? 18. What magnification do examiners use to compare standards to the evidence? 15. Were the two bullets below fired from the same gun? Explain your answer.