What 3 factors that can prevent a firearm examiner from obtaining a perfect match of striation markings around the periphery of two bullets?

Answer 1

Three factors that can prevent a firearm examiner from obtaining a perfect match of striation markings on two bullets include: 1) Variability in the manufacturing process of the firearm or bullet, which can introduce minor differences in striation patterns; 2) Wear and tear on the firearm's barrel, which can alter the unique markings it imparts on bullets over time; and 3) Differences in the conditions under which the bullets were fired, such as variations in ammunition type, barrel cleanliness, or shooting techniques, which can affect the final striation characteristics.