Chapter Introduction

Chapters 1 through 8 of this manual provide guidance for training -with the 40-mm grenade launcher» M203 and Chapters 9 through 12 provide guidance ior training with the 40-mm grenade launcher, M79.

This manual contains a discussion of the launchers and their characteristics! disassembly /assembly procedures, launcher controls and sighting equipment, operation and functioning, types and functioning of standard ammunition, Bafety precautions, and marksmanship training.

Users of this manual are encouraged to submit recommended changes or comments to improve it. Comments should be keyed to the specific page, paragraph, and line of text in which the change is recommended. Reasons will be provided for each comment to insure understanding and complete evaluation. Comments should be prepared using DA Form 2028 (Recommended Changes to Publications) and forwarded to the Commandant, US Army Infantry School, Port Benning, Georgia 81905.

CHAPTER 2

CHARACTERISTICS, LAUNCHER CONTROLS, AND SIGHTING EQUIPMENT OF 40-MM GRENADE LAUNCHER, M203

Section I. CHARACTERISTICS

2-1. Description

The 40-mm grenade launcher, M203, is a lightweight, single-shot, breech loaded, pump action (sliding barrel), shoulder-fired weapon attached to the M16/M16A1 rifle (fig 2-1). It consists of a handguard and sight assembly group, receiver assembly, quadrant sight assembly, and barrel assembly.

2-2. Ammunition a. The grenade launcher uses fixed type ammunition. The two major assemblies of a round are the cartridge case and the projectile. There are varieties of high explosive, training, multiple projectile (buck Bhot), illuminating, and signaling rounds (both standard and developmental types) available for use in the M203.

b. For detailed information on ammunition, see chapter 4.

a. Weapon.

Weight (loaded) (M16A1 and M203) 11 lb (approx) Trigger pull---------------------5 lb b. Ammunition.

c. Operational Characteristics.

Action Pump

Maximum effective range (area targets)_______________________360 ra

Maximum effective range (point target) — 150m

Minimum aafB firing rangei (HE and TP):

Training 80 m

M203 40mm Grenade Launcher

Figure 1-1. The 40-mm grenade launcher, MX0S attached to the M16A1 rifle.

Functioning Cycle M16a1

receiver assembly hand grip

IDENTIFICATION MARKINGS

sight windage screw barrel assembly barrel stop •

handguard 4. sight assembly group barrel latch elevation adjustment machine screw sight leaf

(2) Controls and identifications.

Figure 2-1.—Continued.

Section II. CONTROLS

2-4. Safety

The safety is just forward of the trigger, inside the trigger guard. To fire the launcher, the safety must be in the forward position (1, fig 2-2). To place the launcher on safe the safety must be in the most rearward position <2, fig 2-2). The safety must be manually placed on the safe or fire position.

2-5. Trigger and Trigger Guard

The position of the trigger and trigger guard is shown in 1, figure 2-3. The trigger guard protects the trigger. Depressing the rear portion of the trigger guard allows the trigger guard to rotate down and away from the magazine well of the rifle thus allowing the grenadier to fire the weapon while wearing gloves or mittens (2, fig 2-3).

2-6. Barrel Latch

The barrel latch is on the left side of the barrel (fig 2-4). This latch locks the barrel and receiver together. To open the barrel, depress the barrel latch and slide the barrel forward.

M79 Receiver

SAFETY

M203 Trigger Assembly

trigger

M203 Mounting Bracket

(1) Trijorer ffuard.

Figure 2-3. Trigger and trigger guard.

(1) In the firing position. Figure 2-2. Location of the safety.

(1) Trijorer ffuard.

Figure 2-3. Trigger and trigger guard.

(2) Trijcp^r guard rotated down.

Figure 2-3.—Continued.

trigger

(2) In the safo position. Figure 2-2.—Continued.

Trigger M79

Section III. SIGHTING EQUIPMENT

2-7. Quadrant Sight

The Quadrant sight assembly mounts on the left side of the carrying handle of the M16/ M16A1 rifle. The quadrant sight assembly consists of a mounting screw, quadrant sight assembly clamp, sight bracket assembly, sight latch, rear sight aperture, sight aperture arm, front sight post, and sight post arm.

a. Quadrant Sight- Assembly Clamp, Sight Bracket Assembly and Mounting Screw (1, fig 2-5). The quadrant sight assembly clamp and sight bracket assembly hold the quadrant sight assembly to the carrying handle of the Ml 6/ M16A1 rifle and are secured by a mounting screw inserted through the right side of the quadrant sight assembly clamp, into the sight bracket assembly.

b. Quadrant Sight Arm and Range Quadrant <2, fig 2-5). The quadrant sight arm serves a dual purpose. It mounts the sight aperture arm (which holds the sight aperture) and the sight post arm (which holds the front sight post). This permits the sight to pivot on the range quadrant to the desired range setting. The range quadrant is graduated in 25-meter increments from 50 to 400 meters. To move the quadrant sight arm along the range quadrant, move the sight latch rearward. This rearward pressure unlocks the quadrant sight arm allowing it to move along the range quadrant so that the desired range number can be centered in the window on the quadrant sight arm. To lock the sight in position, release the sight latch.

e. Front Sight Post (2, fig 2-5). The front sight post mounts on the quadrant sight arm by means of a pivot bracket that can be opened when the sights are in use or closed when not in use, to prevent damage to the sights. The sight post can ba used to make minor adjustments in elevation when zeroing the launcher. For elevation adjustments, turn the elevation adjustment screw on the sight post to the right to decrease elevation and to the left to increase elevation. One full turn on the elevation adjustment screw will move the impact of the projectile 5 meters at a range of 200 meters.

d. Rear Sight Aperture (2, fig 2-5). The rear sight aperture connects to the sight aperture arm, which is attached to the rear portion of the quadrant sight arm. The sight aperture arm serves the same purpose as the sight post arm. The rear sight aperture can be adjusted for minor changes

UPPER RECEIVER CROUP

sight bracket

QUADRANT SIGHT ' ASSEMBLY CLAMP |

Browning Buck Mark Disassembly Guide

(1) Quadrant sight assembly clamp, sight bracket assembly, and mounting screw.

Figure 2-5. Quadrant sigkt assembly.

(1) Quadrant sight assembly clamp, sight bracket assembly, and mounting screw.

Figure 2-5. Quadrant sigkt assembly.

UPPER RECEIVER CROUP

sight bracket

QUADRANT SIGHT ' ASSEMBLY CLAMP |

in deflection when zeroing the launcher. For windage adjustment, press the rear sight retainer and move the aperture away from the barrel to move impact to the left. One notch on the rear sight aperture will move the impact of the projectile I14 meters at a range of 200 meters.

The sight leaf base is part of the handguard and sight assembly group. It is located on top of the handguard and consists of a sight leaf, sight leaf base, sight leaf mount, elevation adjustment machine screw, and a sight windage screw. The elevation and windage scales are marked on the sight leaf mount. The sight leaf is a folding, adjustable open ladder design that permits rapid firing without sight manipulation. The sight leaf uses the front sight post of the M16/M16A1 rifle as the front aiming post.

a. Sight Leaf Base (fig 2-6). The sight leaf base is permanently attached to the rifle handguard by two mounting screws. The sight leaf base serves to protect the sight leaf from damage when the leaf is not being used and in the down position.

6. Sight Leaf Mount and Sight Leaf (fig 2-6). The mount is attached to the sight base and is used to raise or lower the sight leaf blade. The sight leaf is graduated in 50 meter increments from 50 to 250 meters and numbered at 100 and 200 meters.

c. Elevation Adjustment Sorexo and Elevation Scale (fig 2-6). The screw attaches the sight leaf to the sight mount. To make minor adjustments in elevation when zeroing the launcher, the sight leaf can be moved up or down by loosening the screw. The rim of a 40-mm cartridge case may be used to turn the elevation adjustment screw. Raising the sight leaf increases the range and lowering it decreases the range. The elevation scale consists of five lines spaced equally apart on the sight leaf. The index line is on the left of the sight leaf. One increment will move the impact of the projectile 10 meters in elevation at a range of 200 meters.

d. Windage Screw and Windage Scale (fig 2-6). The left end of the screw consists of a knob which is used to turn the sight windage screw to adjust for deflection. The windage scale consists of a

M203 Aperture

SIGHT POST arm

RANGE QUADRANT

QUAORANT SIGHT ARM

FRONT SIGHT POST

SIGHT LATCH

REAR SIGHT APERTURE RETAINER

REAR

SIGHT

APERTURE

SIGHT APERTURE ARM

ELEVATION ADJUSTMENT SCREW

zero line in the center of the scale and two lines spaced equally on each side of the zero line. When making minor adjustments in deflection while zeroing the launcher, one increment on the windage scale will move the impact of the projectile 11/2 meters at a range of 200 meters.

Mechanical Leaf Sight

LAUNCHER

SIGHT LEAF

SIGHT LEAF MOUNT

SIGHT LEAF BASE

FRONT SIGHT POST

ELEVATION SCALE

SIGHT WINDAGE SCREW

Type Grenade Launcher

SIGHT LEAF

WINDAGE SCALE

ELEVATION ADJUSTMENT SCREW

Figure 2-6. Grenade launcher, sight leaf, and front sight post of the M16A1 rifle.

SIGHT LEAF

WINDAGE SCALE

ELEVATION SCALE

ELEVATION ADJUSTMENT SCREW

SIGHT WINDAGE SCREW

Figure 2-6. Grenade launcher, sight leaf, and front sight post of the M16A1 rifle.

CHAPTER 3

MECHANICAL TRAINING, OPERATION AND FUNCTIONING

Section I. Disassembly and Assembly

This chapter contains instructions for mechanical training, operation and functioning of the 40-mm grenade launcher, M203.

3-2. General Disassembly

Grenadiers are authorized to disassemble the launcher as follows :

а. Clear the weapon by depressing barrel latch and sliding the barrel assembly forward (fig 2-4). Inspect the breech to insure that no round is present.

б. Loosen the mounting screw and remove the quadrant sight assembly from carrying handle of the M16/M16A1 rifle (1, fig 2-5).

c. There are two methods for removing the barrel assembly:

(1) Depress the barrel latch and slide the barrel assembly forward. From the muzzle of the M16A1, count back to the fourth hole on the left side of the handguard. Insert one end of a section of cleaning rod into the fourth hole, depress the barrel stop, and slide the barrel assembly off the receiver track (1, fig 3-1).

(2) Remove the handguard and sight assembly, push down on the slip ring of the M16A1, pulling down and out on the base. Depress the barrel latch and slide the barrel assembly forward. Then depress the barrel stop and slide the barrel assembly from the receiver track (2, fig &-1).

M203 Handguards Installation

CLEANING ROD SECTION

BARREL ASSEMBLY

NOTE: DEPRESS BARREL STOP AND SLIDE BARREL ASSEMBLY TO/FROM LAUNCHER

HANDGUARD AND SIGHT ASSEMBLY

(1) First Method Figure 8-1. Removal of barrel assembly.

M79 Grenade Launcher Parts
(2) Second Method Figure 3-1. Removal of barrel assembly.

3-3. Assembly

Assembly of the grenade launcher is the reverse of disassembly.

a. Slide barrel assembly onto receiver until barrel stop engages.

b. Install quadrant sight bracket assembly and quadrant sight assembly clamp to carrying handle of the M16/M16A1 rifle, then tighten mounting screw.

Section II. OPERATION AND FUNCTIONING

3-4. Preparation for Firing a. Check the bore to be sure it is clear and dry.

b. Check the launcher to be sure it is clean.

c. Inspect for defective parts.

3-5. Functioning a. Unlocking (1, fig 3-2). Unlocking is accomplished by depressing the barrel latch and sliding the barrel assembly forward.

(1) The weapon is cocked when the barrel assembly is opened.

(2) The barrel latch, when depressed, unlocks the barrel assembly so that it can be moved forward along the receiver assembly.

(3) As the barrel assembly and barrel extension, which are interlocked with the cocking lever, move forward, the cocking lever is forced down ward which in turn forces the spring loaded firing pin rearward.

(4) The spring loaded follower moves forward with the barrel extension. As the barrel assembly continues its forward movement the barrel extension disengages from the cocking lever, and the follower holds the cocking lever in the down position.

(5) When the barrel assembly is moved rearward the follower is also forced to the rear. The cocking lever again engages the barrel extension and the firing pin moves slightly forward and engages the primary trigger sear. The weapon is then cocked.

(1) Extraction and cocking take place at the same time.

(2) As the barrel assembly is opened, a 3pring loaded extractor keeps the spent cartridge

40mm Grenade Launcher

BARREL LATCH

(1) Unlocking the barrel. Figure 3-2. Functioning of tke launcher.

FOLLOWER BARREL EXTENSION

M203 Follower Inside

COCKING LEVER

(2) Cocking the launcher.

Figure 3-2.—Continued.

COCKING LEVER

(2) Cocking the launcher.

Figure 3-2.—Continued.

seated against the receiver until the barrel is clear of the cartridge case.

d. Ejection (4, fig 3-2). Ejection is accomplished by a spring loaded ejector pushing the expended cartridge case or live round from the barrel assembly.

e. Loading (1, fig 3-3). When the barrel assembly is in the open position the cartridge is inserted into the breech end of the barrel.

(1) Chambering takes place during the closing of the barrel assembly.

(2) As the breech end of the barrel assembly closes the extractor contacts the rim of the cartridge and the round is firmly seated.

g. Locking (3, fig 3-3). As the barrel assembly closes, the barrel latch becomes engaged to the

M433 Hedp Tdp

EXTRACTOR

(3) Extraction. Figure S-t.—Continued.

EJECTOR

40mm Grenade Packing And Assembling

EMPTY CASE

Figure 3-2.—Continued.

barrel assembly and the cocking lever engages the barrel extension so that it cannot be moved forward along the receiver assembly.

h. Firing (4, fig 3-3). As the trigger is pulled rearward, the primary trigger sear is disengaged from the bottom sear surface of the firing pin, releasing the spring driven firing pin and causing it to be forced forward against the primer of the cartridge.

Asm Loading Lever Latch
(1) Loading the launcher. Figure SS. Operating the launcher.

FOLLOWER

BARREL EXTENSION

M79 Grenade Launcher

COCKING LEVER

(2) Chambering. Figure SS.—Continued.

FOLLOWER

COCKING LEVER

BARREL EXTENSION

(2) Chambering. Figure SS.—Continued.

Grenade Launcher

(3) Locking the barrel.

Figure 3-3.—Continued.

FIRING PIN

M16 Immediate Action

TRIGGER

Figure 3-3.—Continued.

Section III. STOPPAGES AND IMMEDIATE ACTION

3-6. Stoppage a. A stoppage is any unintentional interruption in the functioning of the weapon. Some common stoppages are: a failure to fire, a failure to chamber, a failure to extract, a failure to cock.

Immediate action is the unhesitating application of a probable remedy without considering the cause of the stoppage. To apply immediate action, follow the same procedure prescribed for a failure to fire in paragraph 3-8.

c. Troubleshooting is the systematic «tody of trouble signs, testing to determine the defective purl, andapplying corrective action (chart 8-1).

3-7. Hangfire and Mliflrt a. Hang fire. A fctmffjirs is a delay'in-the functioning of a propelling-charge-explosive-train at the time of firing. The amount of delay is unpredictable, buttn moefcsBes it falls intlie range of a split second to 80 seconds. Any failure to fire mutt be considered to be a hang Are until that possibility has been eliminated.

b. Misfire. A misfire is a complete failure to fire. A misfire in Itself la not dangerous, but since it cannot be immediately distinguished from a delay in the functioning of the firing mechanism or a hangfire, it must be considered to be a hangfire until proven otherwise. A delay in the functioning of the firing mechanism could result from the presence of grit, sand, frost» ice, or excess oil or grease.

After a failure to Are, due to the possibility of a misfire" or han&fire, the following precautions must be observed until the round has been removed from the weapon and cause of failure determined :

o. Shout "MISFIRE," keep the weapon trained on the target; end all troops clear of the muaale.

Warning: Before atteptpting io remove the round from the grenade launcher, own not re* quired for the operation must be cleared from tile vicinity.

b. Wait SO seconds from the time of failure to fire before opening the breech for unloading procedures.

p. Exercise extreme caution during unloading procedures; where circumstances permit, either catch the ejected round or reduce the distance of free fall to ground.

d. After the round has been removed from the receiver) determine whether the round or the firing mechanism Is defective. Examine the primer to see If It has been dented. If the primer has not been dented, the firing mechanism is at fault. The round may be reloaded and fired after the cause of the failure to fire has been corrected.

e, If the primer has been dented, keep the round separate from other ammunition until it can be properly disposed of.

Shouting "MISFIRE" should apply only to training situations.

Chart 8-1. TrovbttthooHnp

Mttfu DA Ion

CwhmIw mtfem

Failure to fire ..

Failure to cock

Failure to lock

Fftlhu* to dumber»

Failure to extinct.

Safety on_________________—______________________Place In fire poaitioo.

Empty dumber__________________________________Load Weapon.

Wliter or ex»» lubricant in firing pin writ--------Hand cycle wpn lewal time« to indade pulling the trigger.

Dirt or reridue in firing pin reeaaa __________________Clean.

Burred war or firing pin---------------------------Replae».*

Dirty firing pin wd] opening_________—--------------Clean firing pin well opening.*

Weak or broken firing pin eprlaf -----------------------Replace.*

Improper aaierobly of coddnff letar --------------------RaaMemble.*

Looae, broken, or miielng cooking lever spring pin Raplaee.*

Excel» plaatic on breed» end ot barrel aisaably Trim exeeu plaatle until barrel awwmbly will look.*

Dirty follower aiaambly or reeaWar eavtty — Clean.

Faulty ammunition____-_________________________Reload.

Dirty chamber ____________________________Clean bore and chamber.

Defective extractor on spring or apriag pin------Replace.*

Ruptured cartridge ease--------------—---------Remove from barrel

Chart 3-î. Contlnned

Iflatftfiwtlon

Probmbl« oaoii

Corrective totlon

Failure to eject -

Worn, broken, or missing ejector spring or

Replace.*

retainer.

Safety faili to

Broken or worn safety or misting spring pin —

Replace.*

stay In

position.

Sight will not

Sight mounting machine screw loose--------

Tighten screw or replace if dented or broken.

stay in selected

position.

•Procidum to Km «ecompllihcd by DB/08 Milutcntiue.

•Procidum to Km «ecompllihcd by DB/08 Milutcntiue.

CHAPTER 4 AMMUNITION

4-1. General

The 40-mm cartridge is a fixed-type munition which consists of two major assemblies (fig. 4-1): the cartridge case and the projectile.

4-2. Cartridge Cate

The aluminum cartridge case is made with an integral propellent retainer. Into this retainer la in-« serted a thin-walled brass cup containing the propellent. An aluminum base plug which seal» the base of the cartridge caBe is then preened into the propellent retainer.

a. There are five standard "A" types of 40-mm ammunition for use with the launches: HIGH EXPLOSIVE (HE), HIGH EXPLOSIVE AIR-BURST (HE AIRBURST), HIGH EXPLOSIVE SMOKELESS AND FLASHLESS, AND &GH EXPLOSIVE DUAL PURPOSE (HEDP), and TRAINING PRACTICE (TP) (fig 4-2)» f

(1) The HIGH EXPLOSIVE ROUNDS contain a grenade 1.6 inches in diameter, with about 1.25 ounces of explosive (fig 4-1). The grenade is formed of rectangular-wrapped steel wire. The wire is notched at intervals to allow for fragmentation upon detonation of the grenade.

(2) The PRACTICE ROUND is ballistically matched to the high explosive (HE) round and is filled with a yellow dye powder. Upon Impact, the fuze booster breaks open the grenade and disperses the powder as a puff of yellow smoke which is visible out to the maximum range of the launcher.

b, Both standard and developmental ammunition (app B) designed for the 40-mm grenade launcher, M79, is normally adaptable to the M208 grenade launcher.

Warning; MAKE NO ATTEMPT UNDER ANY CONDITIONS TO FIRE 40-MM HIGH VELOCITY AMMUNITION IN THE M203 GRENADE LAUNCHER. (This ammunition ii for um In automatic . grenade launchers. Those rounds are longer and more powerful than the ammunition made for the M203/M79 weapons.)

Identification (fig 4-2)

The HE (406), JJE (463), and TP (M407A1) are Identical in size and shape. However, the weight of the M463 is slightly greater than the M406 or the M407A1. There are two notches on the rim of the M46S to identify it during the hours of limited visibility. The appearance of the HE airburst round differs from the M406, M468, and M407A1, in that the skirt is longer and the ogive is smaller. However, the sizefciid weight of the HE airburst and the JJE (M488) dual purpose round are almost identical.M406, M488, and M897 have gold colored c^i* while the M407A1 has a silver colored oglVe'and-the M468 has a black colored ogives >*;■•'■ffi -

The M55i and MW1 impact detonating fuzes are used with the HE and the TP rounds. The M552 fuze arms b^.a spin action and is armed about 8 meters from the muzzle. The M551 fuze arms by a spin and setback action and must travel between 1'4 and 28 meters before being armed (fig 4-1). The HE airburst round is equipped with the M586 fuze that incorporates the same spin and setback action as well as the same arming distance as the M551 fuze. Upon impact the fuze ignites a separation charge assembly which ejects a grenade into the air. At a height of about 5 feet the grenade explodes into fragments.

High»Low PropuWon System (fig 4-3)

To propel a 40-mm projectile from a shoulder fired weapon requires a high-low propulsion system. This system functions as follows : when the firing pin strikes the prim«» the primer flash ignites the propellant which is contained within the brass powder-charge cup inBide the high pressure chamber. The burning propellant creates a pree-

LOW PRESSURE CHAMBER

VENT HOLES

VENT HOLES

40mm Grenade Venting

ALUMINUM OGIVE

PRESSURE PLATE

FUZE ASSEMBLY

PROJECTILE SKIRT

GRENADE

EXPLOSIVE

DETONATOR

CARTRIDGE CASE

RETAINER CUP

HIGH PRESSURE CHAMBER

base plug primer

ALUMINUM OGIVE

PRESSURE PLATE

FUZE ASSEMBLY

PROJECTILE SKIRT

GRENADE

EXPLOSIVE

DETONATOR

CARTRIDGE CASE

RETAINER CUP

HIGH PRESSURE CHAMBER

base plug primer

Figure i-î. Cross section of the iO-mvi cartridge, HE round.

sure of 35,000 pounds per square inch within the high pressure chamber, causing the brass powder-charge cup to rupture at the vent holes. As the vent holes rupture, the gases flow into the low pressure chamber (interior portion of the cartridge case). As the gases enter the larger area, the pressure is reduced to 3,000 pounds per square inch which is sufficient to propel the projectile through the barrel and to the target. The grenade leaves the barrel of the launcher with a muzzle velocity of 250 feet per second and a right-hand spin of 37,000 revolutions per minute. The spin stabilizes the grenade during flight and provides rotational forces necessary to arm the fuze.

M203 Grenade Cartridge

SILVER

BLACK,

CARTRIDGE, 40rm.i TP M38 2 0R V407

CARTRIDGE/4Ct>ti rfE AIRBURST M397

MAOKfL^SS/.SO F^ ASHLESS M+63

CARTRIDCE, 40rr.ii Mí' DUAL PUR°OSF M433

CREAM OR LT OLIVE

Figure 4-t. Some standard iO-mm cartridges available for use with the grenade launcher, M£OS.

4-7. Effective Casualty Radius

The high explosive grenade has an effective casualty radius of 5 meters. The effective casualty radius is defined as the radius of a circle about the point of detonation in which it may be expected that 50 percent of exposed troops will become casualties.

4-8. Combat Load

The recommended minimum combat load is 36 rounds of HE 40-mm ammunition.

All HE and TP ammunition is packed in wooden boxes containing 12 bandoleers of 6 rounds each for a total of 72 rounds.

Low Pressure Velocity Propellant

WHEN IGNITED BY THE PRIMER, THE PROPELLANT ENCLOSED IN THE BRASS POWDER CHARGE CUP (HIGH PRESSURE CHAMBER) RUPTURES THE CUP AT THE VENT HOLES AND IS VENTED INTO THE REMAINDER OF THE CARTRIDGE CASE (LOW PRESSURE CHAMBER)

High Low Pressure Chamber
Figure i-4. High-low propuleion tyeUnt.
M16a1 Mark

PLASTIC SUPPORT

BANDOLEER

Figure UO-mm ammunition bandoleer and packaging.

CHAPTER 5 MAINTENANCE

5-1. General

Maintenance includes all measured taken to keep the launcher in operating condition. This includes cleaning, inspection for defective parts, lubrication, and repair.

5-2. Cleaning Material, Lubricants, and Equipment a. Cleaning Materials.

(1) Rifle bore cleaner (RBC) is used for cleaning the bore of the launcher and provides temporary protection from corrosion.

(2) Any dry cleaning solvent that does not contain acid can be used for cleaning the launcher of grease, oil, or corrosion-preventive compounds.

b. Lubricants.

(1) Military lubricant, MIL-L-46000A (LSA) is used for lubricating the launcher at temperatures of —85° Farenheit and above.

(2) Weapons lubricating oil MIL-L-141078 is used at temperatures below 0° F. '

c. Equipment.

<1) A set of maintenance equipment is shown in figure 6-1.

(2) Maintenance equipment is carried in a canvas case that can be attached to the universal small arms ammunition pouch or to the front of the universal load carrying equipment harness (fig 6-2).

5-3. Cleaning and Launchar a. The launcher must be cleaned after it has been fired because firing produce® deposits of primer fouling, powder ashes, carbon, and metal fouling. These deposits may collect moisture and promote rust if not removed. The cleaning procedure described below will remove all deposits except metal fouling which should be removed by the unit armorer.

b. After firing, field strip the launcher and clean it as follows :

<1) Bore. Attach a clean, dry rag (the size of a handkerchief) to the thong and thoroughly moisten the rag with rifle bore cleaner. Pull the rag through the bore several times. Attach the bore brush to the thong,, pull it through the bore several times, and follow this with more damp rags {fig 6-8). Pull dry rags through the bore and inspect each rag as it is removed. The bore is clean when a dry rag is removed which shows no evidence of fouling, Finally, pull a lightly oiled oil

Grenade Launcher

lubricant -.case (m 79 grenao6 launcher only) *

RIFLE OREASE

lubricant -.case (m 79 grenao6 launcher only) *

CLEANING BRUSH

^screwdriver and wrench combination (m79 grenade launcher only) bore brush

^screwdriver and wrench combination (m79 grenade launcher only) bore brush

Bore Brush M203 Pictures

Fig*** ff-i. MaMntum mufrnwii

THONO

Fig*** ff-i. MaMntum mufrnwii

Crew Served Leather Ammo Pouch

AMMUNITION POUCH SECURING STRAP

CASE

SECURING STRAP

AMMUNITION POUCH

CASE

Case Small Arms Accessories

Figure 5-2. Small arms accessories cane attached to the universal ammunition pouch or harness.

M79 Grenade Launcher Parts
Figure 5-3. Cleaning the bore with thong and bore brush.

(LSA) rag through the bore to leave a light coat of oil inside the barrel.

(2) Breech, insert Clean the face of the breech insert retainer with a patch and bore cleaner. Remove the bore cleaner with dry rags, and oil lightly.

(3) All other parts. Use a brush and dry rag to clean all other parts and exterior surfaces. Apply a light coat of LSA to the exterior of the launcher after cleaning.

5-4. Normal Maintenance

Inspect the launcher daily for evidence of rust, burred, worn, or cracked parts. Report defects to the armorer for correction. Authorized organizational maintenance for the M203 is shown in chart 5-1.

5-5. Special Maintenance a. Where the temperature falls below freezing

Chart S-i. Authorifd Organizational Matnt+nam* (904)

OrtfwdUr Ansoitr

Grenade launcheri

Initallation/ramoval on rlfl»_____

Handffuard and »isfht awembly group: Be moral/installation_________„„

lUplac« machlna icrew («t^ht l«*f and light leaf ban)________________________________________________________ z

R«p]i«i key wtihir___________________________________________________________

Repine« right leaf________-___________________________________________________________________________ *

Replace handguard__________________________________________________________________________________________ *

Claiming and lubrication_________________________________________________________________________________________________x x

Quadrant tight assembly i

Removal/initallatlon____________________-________________________________________________________________x *

Replace mounting icrew_________________________________________________________________________________________________ x

Replica «lght damp__________________________________________________________________________________________ X

Replace light poet_________________________-________________________________________________________________„ X

Cleaning and lubrication________________________„__________________________________________________________x x

Barrel aieembly:

Ramoral/initallatlott__________-________..____________________________________________________________________________x x

Cleaning and lubrication —_________________________________________________________________________________x x

BecelTer aiumbly:

Replace back plat«_____________________________________-____________________________-- x

Replace barrel «tension follower_____________________________________________________ x the launcher must be kept free of moisture and excess oil by wiping all metal part» with a clean dry ray after performing normal maintenance. Moisture and excess oil on the working parts cause them to operate sluggishly or fall completely. The launcher must be disassembled and wiped with a clean dry cloth. It is beet to keep the kuncher as close as possible to outside temperatures at all times to prevent the collection of moisture which occurs when cold metal comes in contact with warm air. If the launcher is brought into a warm room it should be allowed to reach room temperature and be cleaned.

In hot» humid climates, or when exposed to a salt water atmosphere, inspect the launcher thoroughly each day for signs of moisture and rust.

c. In hot, dry climates the launcher must be cleaned daily or more often to remove sand or dust from the bore and working parts. In sandy areas the launcher must be kept dry to prevent the collection of sand. The muzzle and receiver should be kept covered during sand and dust storms. The launcher should be lubricated when sandy or dusty conditions decrease or when it begins to show rust or corrosion.

d. Instruction on caring for the launcher when it is subjected to nuclear, biological, or chemical contamination is in FM 21-40.

5-6. Storage

Thoroughly clean and dry the bore, the firing mechanism, and the exterior of. the weapon. After the launcher has been dried, be careful not to touch it with bare hands. Coat the launcher with ISA. Never store a launcher in a cloth or similar cover and never plug the bore. This will cause the launcher to collect moisture and rust

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Responses

  • EDWARD
    How do i use the grenade launcher on chapter 23?
    6 years ago
  • severi
    What is an MK19 quadrant sight?
    6 years ago
  • sirpa
    How to lower yugo sks sight grenade launcher?
    5 years ago
  • Demsas
    Does the front sight post to the m203 quadrant sight suppose to be tile?
    5 years ago
  • cain murray
    How often does a firing pin where out on 40mm RPG launcher?
    4 years ago
  • Clara
    How to make a 40mm grenade launcher?
    4 years ago
  • arja
    How to replace the firing pin on an m203?
    4 years ago
  • arsi l
    Is a 40mm base fuze considered MEC or MDAS?
    4 years ago
  • edda
    Where to buy square m203 handguard?
    5 months ago

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