Organizational Maintenance Instructions

CHAPTER OVERVIEW

This chapter contains information and instructions 10 help keep tne weapon in good repair. Tne chapter contains:

a. Repair Paris, Special Tools. TMDE. and Support Equipment b Service Upon Receipt c. Preventive Maintenance Checks and Services (PMCS) ci. Troubleshooting e. Decontamination of Rifles and Arms Rooms f. Maintenance Procedures *

Section I. REPAIR PARTS, SPECIAL TOOLS, TMDE, AND SUPPORT EQUIPMENT

2-1. COMMON TOOLS AND EQUIPMENT. For authorized common tools and equipment, refer to the Tabl e of Organ izaiion and Eq ui pment/Modified Table of Organization and Equipment (TOE/MTOEf) applicable to your unit.

2-2. SPECIAL TOOLS, TMDE, AND SUPPORT EQUIPMENT. Special tools required for organizational support are listed in appendix C. Fabricated tools are listed and illustrated in appendix E.

2-3. REPAIR PARTS. Repair parts are listed in and illustrated in appendix C of this manual.

Section II. SERVICE UPON RECEIPT

a. Inspect the weapon for damage incurred during shipment. If the equipment has been damaged, report the damage on SF Form 364, Report of Discrepancy (ROD).

b. Check the weapon aqainst the packing slip to see if the shipment is complete. He port all discrepancies in accordance with the instructions in TM 38-750.

c. Check to see whether the equipment has been modified.

d. Check to see if all MWO s have been applied.

2-5. SERVICE UPON RECEIPT OF MATERIEL. Refer to the following table.

SERVICE UPON RECEiPT - M16IM16A1 RIFLE

LOCATION

ITEM

ACTION

REMARKS

M16/M16A1 Rifle a. Charging handle assembly (1)

Clear the weapon

M16 Parts Worksheet

WARNING

To avoid injury to your eye, use care when removing and installing spring-loaded parts b. Bolt carrier assembly Remove, and bolt assembly (2)

Reference TM 9-1005-249-10

Parts Bolt Action M16a1

c. All components Visually inspect for proper Reference assembly, damage, or for mis- TM 9-1005-249-10. sing parts. Clean and lubricate.

NOTE

Wipe excess oil from bore and chamber. Particular attention should be given to cleaning the bolt carrier key.

d. Boit carrier assembly and bolt assembly

Reassemble.

Reference TM 9-1005-249-10

e. Cartridge magazine

Hand function to assure proper Reference operation. TM 9-1005-249-10.

Check for positive retention and Reference functioning of bo't catch. TM 9-1005-249-10

TM 9-1005-249-244 P

Section III. PREVENTIVE MAINTENANCE CHECKS AMD SERVICES (PMCS)

2-6. GENERAL. This section contains the procedures and instructions necessary to perform organizational preventive maintenance checks and services. These services are to he performed by organizational maintenance personnel with the assistance, where practical, of the operator/crew.

2-7. PREVENTIVE MAINTENANCE CHECKS AND SERVICES.

WARNING

Before starting an inspection, be sure to clear the weapon. Do not keep live ammunition near the work area.

a. Générai The PMCS procedures are contained in the table below. They are arranged in logical sequence requiring a minimum amount of time and motion on the part of the persons performing them and are arranged so that there will be a minimum interference between persons performing checks simultane-ously on the same end item.

b. item Number Column. Checks and services are numbered in chronological order regardless of interval. This column shall be used as a source of item numbers for the J,TM Number11 column on DA Form 2404, Equipment Inspection and Maintenance Worksheet, in recording results in PMCS.

c. Item To Be Inspected Column. The items listed in this column are divided into groups indicating the portion of the equipment of which they are a part, for example, "Caiiridge Magazine," "Bolt Carrier Assembly."

d. Procedures Column. This column contains a brief description of the procedure by which the check is to be performed. It contains all the information required to accomplish the checks and services.

ORGANIZATIONAL PREVENTIVE MAINTENANCE CHECKS AND SERVICES QUARTERLY SCHEDULE

Item

Item To Be Inspected

Procedures

WARNING

Before starting an inspection, be sure to clear the rifle. Do not actuate the trigger until the rtfle has been cleared. Inspect the chamber to ensure that it is empty and no ammunition is in position to be chambered. Do not keep live ammunition near work area.

Cartridge magazine (1) (serviceability check)

Disassemble. Inspect tube for bulges, dents, or damaged feeder lips. Inspect spring and follower for kinks or damage. Replace the magazine if any of the above conditions exist.

Hem No.

Hern To Be Inspected

Procedures

Wj

URNING

Do not interchange bolt assemblies or components from one weapon to another. Doing so may result in injury to, or death of, personnel.

Do not interchange bolt assemblies or components from one weapon to another. Doing so may result in injury to, or death of, personnel.

Bolt carrier assembly and bolt assembly (serviceability check)

Bolt carrier assembly and bolt assembly (serviceability check)

Ar15 Bolt Face PittingM16 Rifle Upper Receiver Diagram

Upper receiver group {hand guards)

M16a1 Disconnector Specifications

Disassemble. Visually inspect bolt assembly (1) for cracks, especially in the area of the cam pin hole. Check for cracks on locking lugs, for a pitted or chipped bolt face, and for an elongated firing pin hole. If defects are found, evacuate to direct support maintenance for repair,

Check for worn bolt rings. Insert the bolt assembly into the bolt carrier and exercise in and out to check for binding. Turn bolt carrier assembly (2) so the bolt assembly (3) points down. The bolt must not drop out. If the bolt assembly drops out of the bolt carrier due to its own weigiu, evacuate to support maintenance for repair (usually bolt ring replacement).

Check extractor and spring and ejector and spring for service^¡!ity. Check carrier key for damage and looseness. II bolt carrier or carrier key are damaged, evacuate to support maintenance. Clean ejector and spring. Lubricate and assemble or repair as necessary. Dented carrier keys may be repaired using the fabricated key tool (E-4, app E). See page E-3.

NOTE

Refer to TM 9-1005-249-10 for "buddy system11 procedure on removing hand guards.

Remove and inspect hand guards (1) internally and externally for cracks and/or damage. Cracks up to one inch in length are acceptable providing they do not adversely affect weapon operation.

Discard and replace the hand guard (1) if: four or more tabs are missing, two adjacent tabs are missing, four rivets are missing, or the heatshield is loose enough to rattle.

Item No,

Item To Be Inspected

Procfriiures

M16 Gas Tub Rifle Lenght Indside Upper

WARNING

Hand check flash suppressor (1) for looseness on barrel (2), then hand check barrel for looseness on upper receiver. Check gas tube, forward assist (3), and rear sight (4) for damage. The rear sight spring should retain the rear sight in either position with firmness. If any of the above are defective, evacuate to support maintenance. Check front sight plunger and spring (5) for damage and corrosion. Clean and lubricate them. Check charging handle and ejection port cover for defects and proper function. Check sling swivel and pin/rivet for damage and proper function. Replace defective components as necessary-

Upper receiver group (serviceability check)

WARNING

Dry cleaning solvent is flammable and toxic and should be used in a well-ventilated area. The use of rubber gloves is necessary to protect the skin when washing rifle parts.

CAUTION

Do not use wire brush to roughen surfaces. Use a well-ventilated area during cleaning and application of solid film lubricant. If solid film lubricant comes in contact with recoiling parts or functioning surfaces of the rifle, remove lubricant immediately by washing with dry cleaning solvent.

Inspect upper receiver finish. If scratched or worn shiny in spots, disassemble and remove all lubricant Irom surface with dry cleaning solvent (item 9, app D). Wear rubber gloves (item 10A, app D) and use a wash pan (item 13A, app D) to apply solvent. Let parts dry thoroughly. Roughen the surface using abrasive cloih (item 6, app D) and apply solid film lubricant (item 13, appD). Allow 16 to 24 hours to dry before handling. Release takedown pin and open receivers. Hold barrel at 40-degree angle fmuzzle down). Pull charging hatidle to rear. Hold bolt carrier to rear and push charging handle forward. Release bolt carrier The bolt carrier should close and lock under its own weight. If it does not, remove the bolt from the carrier and slide the carrier and key assembly (without bolt) back and forth in the upper receiver and barrel assembly. II the gas tube hits the carrier key, or if the gas tube binds in the carrier key, try to correct the malfunction by adjusting (slightly bending) the gas tube slightly in the area of the hand guards. If this does not correct the malfunction, evacuate to support maintenance.

Item To Be Inspected

Procedures

Lower receiver group (serviceability check)

Lower receiver group (serviceability check)

M16 Rifle Upper Receiver DiagramInstructions
Bipod assembly M3 {serviceability check)
Correct Malfunctions M16

Remove buffer (1) and action spring (2). Check buffer for cracks. Replace if cracked. Check »ction spring for kinks and free length. Free length should be 11 3/4 min to 131/2 max inches; if not, replace. Do not attempt to adjust the length.

Remove butt cap screws and shoulder gun stock assembly (3), taking care not to lose the takedown pin (4), detent (5), and spring (6). Clean and lubricate the takedown pin, detent, spring, and hole in the receiver. Check shoulder gun stock assembly components and buttstock for damage. Replace damaged components as necessary. Cracked buttstock can be repaired at support maintenance. Hand check lower receiver extension for looseness and corrosion. If loose, evacuate to support maintenance. Clean and lubricate the extension. Remove rifle grip (7), spring (8), and safety detent (9). Clean and lubricate pivot pin (10), detent (11), spring (12) and receiver holes. Replace defective components as necessary.

Function check the magazine catch, bolt catch, automatic sear, hammer, trigger, and disconnectors. If defective, evacuate to support maintenance. Check lower receiver finish. If scratched or worn shiny in spots, repair in the same manner as outlined for upper receiver.

Check spring tension for retention to rifle barrel. Check legs {1) for damage If defective, replace.

Hem No

Item To Be Inspected

Procedures

7

Bayonet and scabbard (serviceability check)

Remove grips (1) clean and lubricate the bayonet. Check release for retention and release on rifle bayonet lug (2). Bayonet blade (3) should not be broken and ulade should be free of nicks. Blades with blunt points arid any nicks will be restored by storing. Check scabbard (4) for cracks, splits, worn fabric, and missing thong (5).

NOTE

NOTE

During periods of inactivity, perform preventive maintenance quarterly unless inspection reveals more frequent servicing is necessary.

An inactive weapon is a weapon which has been stored in an arms room for a period of 90 days without use. The weapon may or may not have been assigned to an individual.

Normal cleaning (PMCS) of an inactive weapon will be performed every 90 days. Should the unit armorer detect corrosion on a weapon prior to the end of the 90-day period, the PMCS should be performed immediately.

Section IV. TROUBLESHOOTING

a. This section contains troubleshooting information for locating and correcting most of the operating troubles which may develop in the 5.56-mm Rifle M16 and M16A1. Each malfunction for the individual part or assembly is followed by a list of tests or inspections which will help you to determine the corrective actions to take. You should perform the tests/inspections and corrective actions in the order listed.

b. This manual cannot list all malfunctions that may occur, nor all tests or inspections and corrective actions. If a malfunction is not listed or is not corrected by listed corrective actions, see individual repair sections for maintenance instructions on each major assembly.

2-9. TROUBLESHOOTING PROCEDURES. Refer to troubleshooting table for malfunctions, tests, and corrective actions. The symptom index is provided for a quick reference of symptoms covered in the table.

Troublesh oo ting Procedures Page

Bolt fails to lock to rear after firing last round 2-8

Failure to chamber 2-11

Failure to cock 2-10

Failure to cycle with selector lever set on AUTO 2-13

FaifuTe to eject 2-10

Failure to extract 2-9

Failure to feed 2-10

Failure to fire 2-9

Failure to lock 2-12

Fires two rounds with one squeeze of trigger with selector lever set on SEMI {double firing) 2-13

Fires with selector lever on SAFE or when trigger is released with selector lever on SEMI 2-13

Short recoil 2-12

TROUBLESHOOTING

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

Step 2. Magazine follower {2) worn or broken.

Replace magazine.

Step 3. Magazine spring (3) weak or broken.

Replace magazine.

Step A. Magazine feeder lips (4) bent or broken.

Replace magazine.

Exploded Diagram Magazine

1. BOLT FAILS TO LOCK TO REAR AFTER FIRING LAST ROUND. Step 1. Broken bott catch (1) and/or spring.

Evacuate to direct support maintenance.

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

2. FAILURE TO FIRE.

Step 1. Broken firing pin (1).

Evacuate to direct support maintenance

Blaser R93 Lrs Mechanism

Step 2. Firing mechanism and/or tower receiver improperly assembled or has worn, broken, or missing parts

Evacuate to direct support maintenance.

Rifle Colt M16 Pin Receiver Pivot

Step 3. Broken or defective retaining pin (2).

Replace.

Bent Firing Pin

3. FAILURE TO EXTRACT.

Step 1. Defective extractor pin {1), extractor (2), and/or extractor spring assembly (3).

Replace extractor pin (1), extractor (2), and/or extractor spring assembly (3) (p 2-21).

Step 2. Short recoil.

Refer to page 2-12.

Ejector Pin Gun

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

4. FAILURE TO EJECT.

Step 1. Broken ejector (1).

Disassemble and clean.

Step 3. Weak or broken ejector spring (3).

Step 4. Short recoil.

Refer to page 2-12.

5. FAILURE TO COCK.

Step 7. Worn, broken, or missing parts of firing mechanism.

Evacuate to direct support maintenance.

Step 2. Short recoil.

Refer to page 2-12.

Trigger Mechanism Submachine Guns 22lrFailure Feed Chamber M16 Image

6. FAiLURE TO FEED.

Step 1. Magazine catch spring weak or broken.

Evacuate to direct support maintenance.

Sfep 2. Magazine catch (1) defective.

Evacuate to direct support maintenance.

M16a1 Rifle Malfunction

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

Step 3. Magazine catch notch (2) defective.

Replace magazine assembly.

Step 4. Magazine lips (3) burred or broken.

Replace magazine.

Sfep 5. Magazine follower (4) defective.

Replace magazine.

Sfep 6. Magazine spring weak (5) or broken

Replace magazine.

Step 7. Magazine tube (6) dented.

Replace magazine.

Step 8. Magazine catch (1) out of adjustment (will not retain magazine).

Refer to page 3-61.

Sfep 9. Short recoil.

Refer to page 2-12.

Assemble M16 Rifle PicturesM16a1 Carrier Key

7. FAILURE TO CHAMBER.

Step 1. Weak or broken action spring (1 ) (free length

11 3/4 inches minimum to 13 1/2 inches maximum.

Replacing Rings Bolt

Step 2. Short recoil.

Refer to page 2-12.

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

8. FAILURE TO LOCK.

Step 2, Loose or damaged bolt carrier key (2).

Evacuate to direct support maintenance.

Benelli Gun Lock Instructions

Step 3. Improperly assembled extractor spring assembly (3).

Assemble correctly (p 2-21).

Adjust by bending in area of hand guard. Evacuate to direct support maintenance.

Adjusting M16 SightsStepped Fracture Spring

Step 5. Weak or broken action spring (5).

Auto Recoil Adjustment

9. SHORT RECOIL.

Step 1. Weak or broken action spring (1).

Corrective Maintenance Cycle

Sfep 2. Improper gap space or worn, missing, or broken bolt rings (2).

Evacuate to direct support maintenance if rings are worn, broken or mis sing (p 2-18).

M16a1 Auto Trigger And Selector

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

Step 3. Gas leakage caused by broken or loose gas tube (3) around front sight base.

Evacuate to direct support maintenance.

Step 4. improper alinement of gas tube and carrier key

Refer to page 2-19.

Column Lever Failure

10. FAILURE TO CYCLE WITH SELECTOR LEVER SET ON AUTO

Faulty selector lever (1).

Evacuate to direct support maintenance.

11. FIRES WITH SELECTOR LEVER (1) ON SAFE OR WHEN TRIGGER IS RELEASED WITH SELECTOR LEVER ON SEMI.

Worn, broken, or missing parts of firing mechanism.

Evacuate to direct support maintenance.

12. FIRES TWO ROUNDS WITH ONE SQUEEZE OF TRIGGER WITH SELECTOR LEVER {1) SETON SEMI (DOUBLE FIRING).

Perform function test.

It any part of function test {page 2-44) fails, evacuate to direct support maintenance.

Safe Key M16

Section V. DECONTAMINATION OF RIFLES AND ARMS ROOMS

2-10. DECONTAMINATION OF SIGHTS ACTIVATED WITH TRITIUM (H 3).

a. Identification. Tritium sights will be marked with the assembly date and the radiation symbol and stamped H 3, 9 mc.

b. Damage Determination. Evidence of a break in the glass container for the H 3 will be a lack of illumination (assuring the expiration date for the sight has not been exceeded). Radiation from the sight is extremely low and CANNOT be detected with standard issue radiation detectors, i.e., AN/PDR-27.

c. Contamination. The tritium isotope used in the low light level sight is in a gaseous stale and will rapidly diffuse into the atmosphere in the event of breakage. Very little residual contamination should be left on the rifle. All illumination will cease upon loss of H 3 gas.

WARNING

Dry cleaning solvent is flammable and toxic and should be used in a well-ventilated area. The use of rubber gloves is necessary to protect the skin when washing rifle parts.

d. Decontamination. When a broken sight is found, tl IB sight MUST be removed and turned in for disposal in accordance with AR 385-11. After removing the sight, the rifle should be cleaned with dry cleaning solvent {item 9, app D). Wear rubber gloves (item 10A, app D)

and use a wash pan {item 13A, app D) to apply solvent. Let dry, then lubricate with cleaner, lubricant and preservative (CLP) (item 5, app D).

e. Requirements. Because of its small volume of gas and its low energy of emitted radiation, H 3 does not pose a health hazard to the user. Current Army regulations NRC license conditions and Title 10, Code of Federal Regulations, Part 20 require that the above actions be carried out.

2-11. D ECONT AM IN ATI ON O F SIG HTS ACTIVATED WITH PROMETHIUM (Pm 147).

NOTE

Pm 147 is no longer available for issue. It is being replaced with tritium (H 3).

a. Generai. When a sight activated with pro-methium (Pm 147) is found, the sight MUST be removed and turned in for disposal in accordance with

AR 385-11. Contact the local RPO.

b. Identification. Promethium sights are marked with the assembly date, the radiation symbol, and Pm 147, 1 mc.

c. Decontamination. If a sight activated with pro-meth i urn (Pm 147) is fou nd, conduct a survey under the direction of the local RPO. Decontaminate as required in accordance with local procedures.

Section VI. MAINTENANCE PROCEDURES

2-12. INITIAL SETUP. The following will reduce the space required for the initial setup portion of the maintenance procedures.

a. Resources required are not listed unless they apply to the procedure.

b. Personnel Required is listed only if the task requires more than one person. If Personnel Required is not listed, it means one person can do the job.

c. This manual covers two different models. If the maintenance task is applicable to both models, Applicable Configuration will not be listed.

d. The normal standard equipment condition is that the item is removed from end item or next higher assembly and is in the assembled condition. Equipment Condition is not listed unless some other condition is required.

e. The approximate time required is listed on the applicable Maintenance Allocation Chart (MAC).

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Responses

  • Mattiesko Parras
    Where is the gas tube and block on an M16A1?
    8 years ago
  • Hannes
    How close should the buffer tube be to the pin?
    7 years ago
  • Mebrahtu
    How to id a bolt for m16a1?
    6 years ago

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