The primary purpose of rifling (spiral grooves) inside the barrel of a firearm is to:

• A Increase the rate of gas expansion behind the bullet
• B Impart spin to the bullet for gyroscopic stability in flight ✓
• C Reduce recoil transmitted to the shooter
• D Prevent escape of gases past the bullet

Explanation

Rifling consists of spiral lands and grooves cut into the barrel bore. Engaging the bullet, it imparts a rapid axial spin that stabilises the projectile gyroscopically, keeping it point-forward during flight and improving accuracy. Gas escape past the bullet relates to obturation by the cartridge case and bullet fit, not rifling. Recoil reduction is unrelated, and gas expansion is governed by the propellant charge.

Reference: The Essentials of Forensic Medicine and Toxicology, 35th ed.

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Written and medically reviewed by the StethoPrep medical team.