Not Fully Mission Capable if

Quarterly

Magazine

(serviceability check)

Disassemble as In TM 91005-319-10 (operator's manual). Inspect tube (1) for bulges, dents, or damaged feeder lips (2). Inspect spring (3) and follower (4) for kinks or damage. SH-Replace the magazine if any of these conditions exist.

A magazine is not available fu; use with the rifle.

Reassemble magazine and check for binding during operation of follower (4). SH-Replace the magazine if the follower binds.

Quarterly

Army Mission Guns

Charging handle assembly and selector lever

WARNING

If the rifle falls any of the following selector lever tests, evacuate It to support maintenance. Continued use of the rifle could result In injury to, or death of, personnel.

PREVENTIVE MAINTENANCE CHECKS AND SERVICES FOR M16A2 RIFLE (CONT)

Item No.

Interval

Item to be Checked or Serviced

Procedure

Not Fully Mission Capable if:

2

Quarterly

Charging handle

Pull charging handle (1) to rear. Check

Charging handle

(cont)

assembly and

that chamber is clear. Let bolt carrier

does not lock in

selector lever

assembly (2) close. Leave hammer in

place when in the

(cont)

cocked position. Do not pull trigger

forward position.

Place selector lever (3) in SAFE position

Hammer falls.

Pull trigger. Place selector lever (3) in

SEMI position.

NOTE

For the purpose of the

following test, "SLOW" is

defined as 1/4 to 1/2 the

[it!

normal rate of trigger

release.

Pull trigger

Hold trigger to the rear, charge weapon, and release the trigger with a slow, smooth motion, without hesitations or stops, until the trigger is fully forward (an audible click should be heard).

Repeat the above SEMI position test five times

Hammer does not fall.

Hammer falls.

The weapon malfunctions during any of these five tests.

Item

Interval

Item to be

Not Fully Mission

No.

Checked or

Procedure

Capable if:

Serviced

M16A2 and M4 ONLY

2

Quarterly

Charging handle

Place selector lever (3) in BURST

Hammer does not

(cont)

assembly and

position. Charge weapon and squeeze

fall.

selector lever

trigger.

(cont)

Hold trigger to the rear, pull the charging

Hammer does not

handle to the rear and release it three

fall.

times. Release trigger. Squeeze trigger.

NOTE

The burst disconnector should

have held the hammer to the

rear when it engaged the deep

notch of the burst cam.

M4A1 ONLY

Place selector lever (3) in AUTO position

Hammer does not

Charge carbine and squeeze trigger

fall.

Hammer should fall.

Hold trigger to the rear, charge carbine,

Hammer falls.

and release trigger. Squeeze trigger.

Hammer should not fall.

Army Maintenance
2-7 Change 4
PREVENTIVE MAINTENANCE CHECKS AND SERVICES FOR M16A2 RIFLE (CONT)

Item

Interval

Item to be

Not Fully Mission

No.

Checked or

Procedure

Capable if:

Serviced

NOTE

2

Quarterly

Charging handle

Automatic sear should have

(cont)

assembly and

released hammer while holding

selector lever

trigger in the squeezed position

(cont)

before releasing and resqueez-

ing the trigger.

All weapons

With hammer in forward position, using

Moderate finger/

moderate finger/thumb pressure attempt

thumb pressure

to place the selector lever (3) in SAFE

moves selector

position

lever to SAFE posi-

tion.

Change 4

Item

Interval

Item to be

Not Fully Mission

No.

Checked or

Procedure

Capable if:

Serviced

3

Quarterly

Upper receiver

CAUTION

and barrel as-

Do not use screw-

sembly (hand-

driver or any other

guard assem-

tool when removing

blies)

the handguard as

semblies, doing so

may damage the

handguard assem

blies and/or slip.

NOTE

Refer to operator's manual for "buddy system" procedure on removing hand-guard assemblies.

Remove and Inspect hand-guard assemblies (1) internally and externally for cracks and/or damage. Cracks are acceptable providing they do not extend into the handguard retaining flange, or adversely affect rifle operation or operator safety or proper retention of hand-guard assembly. Discard and replace the handguard assembly (1) If the heat-shield is loose enough to rattle when Installed on rifle.

Handguard missing or unserviceable.

Item

Interval

Item to be

Not Fully Mission

No.

Checked or

Procedure

Capable if:

Serviced

Upper receiver and barrel assembly (serviceability check)

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