Infantry Weapons Fundamentals Flashcards

What is the effective casualty radius of the M67 fragmentation grenade?

Answer: 15 meters

The M67 fragmentation grenade has an effective casualty radius of approximately 15 meters.

When employing the M240B machine gun, what technique prevents barrel overheating during sustained fire?

Answer: Using controlled burst fire and conducting scheduled barrel changes

The M240B gunner uses controlled burst fire and rotates spare barrels at regular intervals to manage heat and maintain effective fire.

What is the purpose of the AN/PEQ-15 laser aiming device?

Answer: Project visible and infrared laser beams for aiming and target designation

The AN/PEQ-15 projects both visible and infrared laser beams, enabling accurate aiming in day and night operations when used with night vision devices.

Which malfunction is characterized by a round that fails to eject after firing, leaving the spent case in the chamber?

Answer: Stovepipe / failure to eject

A stovepipe malfunction occurs when the spent case fails to fully eject and is caught by the bolt carrier group, protruding from the ejection port.

What distinguishes a hangfire from a misfire?

Answer: A hangfire has a delayed ignition after trigger pull; a misfire has no ignition

A hangfire involves a delayed but eventual firing of the round after trigger pull, while a misfire means the round fails to fire at all.

The M72 LAW (Light Anti-Tank Weapon) is best described as:

Answer: A disposable, pre-loaded single-shot rocket launcher

The M72 LAW is a lightweight, disposable, single-shot rocket launcher that is discarded after firing.

What is the role of the rifleman's buddy system during immediate action drills?

Answer: Mutual security and assistance — one covers while the other clears a malfunction or reloads

The buddy system ensures mutual support — one Marine maintains suppressive fire while the partner addresses a malfunction, reloads, or moves.