M320- Grenade Launcher

Question 1

What Technical manual covers the M320/M320A1?

Answer 1

TM 3-22.31

Question 2

What is the Caliber for the M320/M320A1 grenade launcher?

Answer 2

40 mm x 46 mm

Question 3

What is the weight (with and without) buttstock for the M320/M320A1 grenade launcher?

Answer 3

With buttstock—7.0 pounds

Without—5.0 pounds

Question 4

What is the length of the M320/M320A1 grenade launcher?

Answer 4

• Without buttstock—11.18 inches
• With buttstock retracted—14.37 inches
• With buttstock extended—19.69 inches
• Barrel—8.46 inches

Question 5

What is the height of the M320/M320A1 grenade launcher?

Answer 5

• Without sights or weapon adapters—6.38 inches
• With mechanical sights down—8.39 inches
• With mechanical sights up—12.05 inches

Question 6

What is the width of the M320/M320A1 grenade launcher?

Answer 6

• With mechanical sights—3.62 inches

- Without mechanical sights—2.56 inches

Question 7

What is the muzzle velocity for the M320/M320A1 grenade launcher?

Answer 7

236.22 feet per second

Question 8

What is the trigger pull for the M320/M320A1 grenade launcher?

Answer 8

11.25 to 15.75 pounds

Question 9

What is the maximum effective range (Area and Point target) for the M320/M320A1 grenade launcher?

Answer 9

Area target—350 m

Point target—150 m

Question 10

What is the maximum range of the M320/M320A1 grenade launcher?

Answer 10

400 m

Question 11

What is the Leaf sight assembly for on the M320/M320A1 grenade launcher?

Answer 11

A flip-up sight used to make windage and elevation adjustments for targets 50 to 350 meters away

Question 12

What is the Hexagonal key wrench used for on the M320/M320A1 grenade launcher?

Answer 12

It is designed with 3-and 5-mm ends to allow the grenadier to remove and install accessories and to make necessary leaf sight adjustments

Question 13

The M320/M320A1 grenade launcher can be attached under the barrel of two host weapons—which host weapon can the M320/M320A1 attach to?

Answer 13

M16-series rifles—M320

M 4 carbines— M320A1

Question 14

What type of rounds does the M320/M320A1 grenade launcher use?

Answer 14

Fixed-type, low-velocity 40-mm rounds

Question 15

What are four (4) methods of destruction for the M320/M320A1?

Answer 15

(1) Mechanical: Use an axe, pick, sledgehammer, crowbar, or other heavy implement
(2) Burning: Use gasoline, oil, incendiary grenades, other flammables, or a welding or cutting torch
(3) Demolition: Use suitable explosives or ammunition or, as a last resort, hand grenades
(4) Disposal: Bury essential parts, dump them in streams, or scatter them so widely that recovering them would be impossible

Question 16

What is the procedure to Clear the M320/M320A1 grenade launcher?

Answer 16

(1) Point the muzzle of the weapon in a safe direction, with the trigger finger outside of the trigger guard
(2) Move the selector lever to the SAFE position (“S”)
(3) Press the barrel release, and allow the barrel to swing out from the left side of the receiver
(4) Inspect the barrel to see if any ammunition is present. If ammunition is present, grasp the rim of the cartridge, and pull it toward the rear of the weapon. Dispose of ammunition in accordance with the unit SOP
(5) Swivel the barrel into the receiver until the locking lever engages the barrel

Question 17

What is procedure to perform a Function check on the M320/M320A1?

Answer 17

(1) Clear the host weapon
(2) Clear the grenade launcher
(3) Rotate the selector lever from the SAFE (“S”) to the FIRE (“F”) position and back to the SAFE (“S”) position with an audible click
(4) With the selector lever in SAFE (“S”) position, attempt to pull the trigger rearward. The trigger must remain in the forward position (no rearward travel)

Question 18

What is the procedure to Load the M320/M320A1 grenade launcher?

Answer 18

(1) Point the muzzle of the weapon in a safe direction
(2) Ensure that the selector lever is in the SAFE (“S”) position
(3) Remove the muzzle cap
(4) Press the barrel release and pivot the barrel out from the receiver
(5) Insert a cartridge into the barrel. Ensure the cartridge is seated fully forward in the rear of the barrel
(6) Pivot the barrel into the receiver until the barrel locking lever engages the barrel. There should be an audible click

Question 19

What is the procedure to Fire the M320/M320A1grenade launcher?

Answer 19

(1) Determine the range to the target using the LRF
(2) Select the range on the DNS to the nearest range in 5-meter increments
(3) Align and center the post of the front sight in the aperture window of the rear sight of the DNS on the target
(4) Move the selector lever to the FIRE (“F”) position
(5) Place your finger on the trigger, and using an even pace and consistent pressure, pull the trigger rearward until the hammer falls and the weapon fires
(6) When finished firing, clear the weapon and move the safety selector lever to the SAFE (“S”) position

Question 20

What is the procedure to Unload the M320/M320A1 grenade launcher?

Answer 20

(1) Point the weapon in a safe direction
(2) Move the selector lever to the SAFE (“S”) position
(3) Press upward on the barrel release lever, and pivot the barrel out from the receiver
(4) Remove any rounds or cartridge cases by hand. Grasp the rim of the round or cartridge case and pull rearward, removing the round or cartridge case from the rear of the barrel. The weapon is now unloaded
(5) Pivot the barrel into the receiver until the barrel release lever engages the barrel
(6) Ensure the selector lever remains in the SAFE (“S”) position

Question 21

What are the characteristics of Fire?

Answer 21

(a) Trajectory—the curve of the fired round as it travels to its target. The trajectory rises as the sights are elevated (3-29)
(b) Line of sight—an imaginary line from the weapon to the target, as seen through properly adjusted sights (3-30)
(c) Ordinate— the vertical distance at any point between the trajectory and the line of sight (3-31)
(d) Maximum ordinate— the greatest vertical distance between the trajectory and the line of sight. It occurs at the highest point of the trajectory (3-32)
(e) Danger space— the area where the round impact or shrapnel from the impact injures personnel or destroys the target (3-33)
(f) Dead space— the area(s) where personnel or targets are safe from direct fire weapons (i.e., ditches, depressions, and ravines)

Question 22

What are two (2) methods of adjusting the day/night sight (DNS) on the M320/M320A1 grenade launcher?

Answer 22

(1) Zeroing using the laser borelight

(2) Zeroing by firing 40-mm training grenades

Question 23

The DA Form 7680 is used to score the qualification firing—what must the grenadier perform to qualify with an M320/M320A1?

Answer 23

A grenadier must perform to prescribed standards and must score at least 60 of 90 possible points—each target hit is worth 10 points

Note: As a minimum, the 40-mm grenade launcher skills test must be administered semi-annually

Question 24

The day/night sight (DNS) is used in conjunction with the laser rangefinder (LRF) on the M320/M320A1 to establish range to a target—what are the components found on the LRF?

Answer 24

• Power button
• Diopter adjustment
• Eyepiece
• Mode button
• Battery cover/compartment

Question 25

The mode button on the laser rangefinder (LRF) allows the grenadier to select the desired unit of measure and mode of operation—what are the modes of operation?

Answer 25

• Standard with automatic SCAN (no LCD display)
• Bullseye (LCD displays bullseye)
• Brush (LCD displays brush and trees)