Which statement accurately compares the twist rates of MK19 and M2?

• A. MK19 has a faster twist than M2
• B. M2 has a faster twist than MK19
• C. They have the same twist rate
• D. The MK19 twist rate is longer by a factor of two

Answer: (A)

Twist rate is how quickly the rifling twists the projectile, measured as inches of barrel per full turn. A faster twist means the bullet or projectile is spun more quickly. The MK19 fires 40mm grenades that require a relatively rapid spin to stay stable in flight, while the M2 Browning fires longer, heavier .50 caliber rounds that are stabilized with a slower twist. Therefore, the MK19 has a faster twist than the M2. The other options don’t fit because they either claim equal twist, attribute the faster twist to the M2, or describe twist in an unrelated way (not how twist rate is typically expressed).