Rifleman Basic RBE Knowledge Practice Exam

Which statement correctly describes the rifling of the M2?

Six lands and grooves, left-hand twist, one turn in fifteen inches Eight lands and grooves, right-hand twist, one turn in fifteen inches Eight lands and grooves, left-hand twist, one turn in fifteen inches Nine lands and grooves, right-hand twist, one turn in fifteen inches

Correct Answer:

Eight lands and grooves, right-hand twist, one turn in fifteen inches

Explanation:

Rifling determines how a bullet is stabilized in flight: the number of lands and grooves sets the bore’s pattern, the twist direction tells you which way the bullet spins, and the twist rate describes how fast that spin is imparted. For the M2 Browning’s barrel, there are eight lands and eight grooves, a right‑hand twist, and a twist rate of one turn in 15 inches. That combination is what stabilizes the long, heavy .50 BMG projectiles this weapon fires, giving reliable accuracy at its typical ranges. The other options would not match the M2’s actual rifling configuration, since they propose a different number of lands/grooves or the wrong twist direction or rate.

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