How do rifling characteristics differ from striations on a bullet?

How do rifling characteristics differ from striations on a bullet?

• A. Rifling characteristics are the overall pattern from lands and grooves; striations are microscopic marks from the barrel surface
• B. Rifling characteristics are microscopic marks; striations are the overall pattern
• C. Both are identical marks
• D. Rifling characteristics relate to primer marks; striations relate to extractor marks

Answer: (A)

In firearm forensics, you’ll look at two scales of marks on a bullet: rifling characteristics and striations. Rifling characteristics come from the barrel’s lands and grooves and form the macro, overall pattern you can observe on the bullet—the arrangement, number of lands and grooves, their width, and the direction of twist. Striations are microscopic, fine scratches created by the roughness and imperfections of the bore’s surface as the bullet travels through it, producing narrowly spaced marks that run along the bullet’s length. The key idea is that the broad, distinctive pattern from the lands and grooves identifies the general rifling style of a firearm, while the tiny, microscopic striations add individual detail tied to the bore’s exact surface condition. This makes the statement correct: rifling characteristics are the overall pattern from lands and grooves, and striations are microscopic marks from the barrel surface.