16-1 Bullet and Cartridge Comparison 16 - Firearms, Tool Marks, and Other Impressions

rifling The manufacture of a gun barrel requires impressing its inner surface with spiral grooves.

rifling The manufacture of a gun barrel requires impressing its inner surface with spiral grooves. This is a step known as rifling.

rifling The manufacture of a gun barrel requires impressing its inner surface with spiral grooves. This is a step known as rifling.

Why rifling? Rifling gives spin to the projectile when it is fired.

Why rifling? Rifling gives spin to the projectile when it is fired. This keeps it on an accurate course.

Why rifling? Rifling gives spin to the projectile when it is fired. This keeps it on an accurate course.

Striations No two rifled barrels have identical striation marks.

Striations No two rifled barrels have identical striation marks.

Striation

Striation The inner surface of the barrel of a gun leaves its striation markings on a bullet passing through it.

class characteristics The class characteristics of a rifled barrel include

class characteristics The class characteristics of a rifled barrel include the number of lands and grooves

class characteristics The class characteristics of a rifled barrel include the number of lands and grooves

class characteristics The class characteristics of a rifled barrel include the number of lands and grooves the width and direction of twist