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GTA 07-01-006 FOR ARMY LESSONSL
Pyrotechnic Signal High-Explosive (HE)
M320/M320A1 and Spotting Round Service Round
NOV 2019
Caliber: 40 mm x 46 mm
GOLD GOLD
GREEN GREEN
GREEN GREEN
Weight: 5 lbs., 7 lbs. (w/stock)
Length: 11.18 in. (no stock)
14.37 in. (retracted)
19.69 in. (extended) HE HEDP
8.46 in. (barrel) M406 DUAL PURPOSE
Muzzle Velocity: 236 feet per second M433
Trigger Pull: 11.25 - 15.75 lbs.
Effective Range: 150 m point target WARNING
Distributed by: Army Training Support Center 350 m area target THE DANGER RADIUS OF THE HE SERVICE
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Max Range: 400 m (at 45 degrees) ROUND IS 165 METERS. M406 AND M433
ROUNDS ARM WITHIN 14 TO 27 METERS.
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ELEVATION IRON SIGHTS
Center for Army Lessons Learned ADJUSTER
10 Meade Avenue, Building 50
Fort Leavenworth, KS 66027-1350
https://call.army.mil
FOR ARMY LESSONS L SAFETY
BLOCK IR
AIMING
LASER

MODE
SELECT AZIMUTH
Reference: SWITCH ADJUSTER
TM 3-22.31, 40-mm Grenade Launchers, November 2010
Distributed by: Army Training Support Center IR
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ILLUMINATOR
RANGE
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KNOB










EARNED 1985
EARNED 1985



Since CENTER
Since CENTER
TM 3-22.31, 40-mm Grenade Launchers, November 2010, Figure 1-6 TM 3-22.31, 40-mm Grenade Launchers, November 2010, Figure 1-1
INTEGRAL RAIL
ANTI-CANT GRABBER BRACKET
INDICATOR BATTERY RAISED LETTER DENOTES COLOR SMOKE COLOR BAND
ORANGE WHITE
CAP/COMPARTMENT 5 DOTS ON STAR GROUND
CLUSTER ONLY LIGHT SMOKE ORANGE
STAR CLUSTER GREEN MARKER WHITE W/
WHITE WHITE - M585 LIGHT RED M713 BLACK
GREEN M715 MARKINGS
REMOTE STAR PARACHUTE GREEN YELLOW M716 BRASS
WHITE - M583
JACK GREEN - M661
GREEN RED - M662 GREEN OLIVE
M583 M585 M713 M715 M716 INFRARED ILLUMINANT
LCD M661 M662 M992
LASER ON LED
INDICATOR
TM 3-22.31, 40-mm Grenade Launchers, November 2010, Figure 1-7 TM 3-22.31, 40-mm Grenade Launchers, November 2010, Table 1-5


TM 3-22.31, 40-mm Grenade Launchers, November 2010, Figure 1-6 TM 3-22.31, 40-mm Grenade Launchers, November 2010, Table 1-5 (continued)
Day/Night Sight (DNS) Duties and Responsibilities Grenadier Knowledge Laser Range Finder (LRF)
DIOPTER
Weight: 15.5 ounces - The M320 is the grenadier's PRIMARY ALWAYS take HE over HEDP unless a light POWER BUTTON ADJUSTMENT
Range: 400 m weapon system, the M4 is the SECONDARY. armor threat is expected. HE has a superior EYEPIECE
Accuracy: plus or minus 5 m fragmentary pattern to cause casualties. The
Batteries: One 123 A-size - The M4 should only be used if the target is HEDP sacrifices fragmentary pattern for
too close to use the M320. light armor penetration and has a higher failure
Azimuth/Elevation Adjuster (used to zero) (dud) rate, HE = big boom HEDP = small MODE
Range adjustment knob: 5 m increments - Know leaf-sight increments without looking. boom.
BUTTON
IR illuminator: Provides night illumination Do not under-mount the M320. Always MODE
IR aiming laser: Used to aim at night - Keep ammunition clean and dry. carry it in the standalone configuration. BUTTON
Anti-cant Indicator: green (good) red (bad) Under-mounting decreases the effectiveness BATTERY
DNS Mode Selection
- Aluminum casing is easily dented; dented of both the M4 and the M320. The increased COVER/COMPARTMENT
Note: IR lasers visible with night vision only
grenades cause chamber/extraction issues. weight unbalances the weapon and increases - The LRF provides rapid and precise ranging
fatigue during carry. Added bulk impedes firing capability out to one mile (1,600 m).
OFF - Identify 40 mm grenades by shape and positions and decreases accuracy. Used as - The LRF uses a 9-volt battery.
DAY Display: day color. Know all minimum safety constraints. a standalone, the M320 is more accurate,
- Display and backlights on, no laser easier to operate, allows the grenadier to - The LRF has seven times magnification.
AIM LOW Display: AL - Understand how to sense and adjust fire. focus on one weapon system, and it is easier - The mode button allows yard/meter selection
- Low power IR aiming laser only to grab the M320 if the grenadier becomes and brush/tree targeting mode.
DUAL LOW Display: dL a casualty. Grenadiers patrol with M4 at the - Performance depends on target; LRF can
- Low power IR aiming laser and illuminator ready (to react to immediate and/or short range a large reflective surface further than
DUAL HIGH Display: dH range contact) and have M320 holstered a small, distorted target (brush, people, etc.).
- High power IR aiming laser and illuminator
for rapid transition. - Atmospheric conditions (rain, snow, and fog)
can also affect LRF performance.
Always use the sights and buttstock. - Use LRF on something large near the target.
Fire Control Measures Grenadier Knowledge Kit Setup and Grenadier Loadout Legend
Pre-planned fire control measures are critical Smoke Holsters allow the M320 to be easily
to the effective use of grenade launchers. - Smoke can be used for direct fire control accessible without interfering with handling DNS day/night sight
(lift/shift). the grenadier's M4 during movement.
Leaders provide: - Smoke obscures enemy vision and masks HE high explosive
- Engagement criteria friendly movements (including breaking Bandoleers carry grenades without altering HEDP high explosive, dual purpose
- Target priority contact). the grenadier's kit. It is easier to pass off or
- Munition selection criteria (HE? Smoke?)
- Limits of fire (such as being near friendlies) Illumination/IR Illumination recover grenades using a bandoleer. in. inches
Sensing and Adjusting Fire - Illumination can be used for direct fire control
(lift/shift). Whether using a bandoleer or a mount on the LRF laser range finder
Grenadiers sense where the round landed - Avoid using illumination during friendly air chest, grenadiers must be able to access
relative to the target. Then adjust elevation support, hanging parachute flares will both grenades and magazines without issue. m meters
and deflection to hit the target. interfere with the aircrew's night vision. Grenadiers must be able to identify what type
Elevation (range): - IR illumination requires night vision devices of grenade is where on his kit without looking. mm millimeters
to see. Do not use illumination by accident!
Short. Impact between you and target - Wind will shift direction of a parachute flare.
Over. Impact beyond target Example Loadout (13 Grenades):
Target. Impact hits the target High Explosive/High Explosive, 9 HE, 4 smoke
Range correct. Impact left/right, range good Dual Purpose (HE/HEDP) (mission dependent)
Doubtful. Impact left/right, range unknown - HE flushes enemy out of cover.
Deflection (deviation/direction): - HE fixes the enemy in place. 12 in the bandoleer, 1 HE in the tube
Right/left of target - HEDP used for lightly armored vehicles. HE on the right, smoke on the left
On-line with the target - HE provides small blast/overpressure.
- HE simulates indirect fire if used in succession.



TM 3-22.31, 40-mm Grenade Launchers, November 2010, Figure 1-8


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