Note

Shiny metal exterior surfaces of the rifle should be recoated with solid film lubricant (Item 21, app D). Clean surface with dry cleaning solvent (item 16, app D); dry, roughen with abrasive cloth (Item 13, app D) and apply solid film lubricant.

Item

Interval

Item to be

Not Fully Mission

No.

Checked or

Procedure

Capable if:

Serviced

Upper receiver and barrel assembly (serviceability check) (cont)

Inspect upper receiver (3) finish for scratches or worn shiny spots.

If scratched or worn shiny in spots, disassemble and remove all lubricant from surface with dry cleaning solvent (item 16, app D). Wear rubber gloves (item 18, app D) and use a wash pan (item 24, app D) to apply solvent. Let parts dry thoroughly. Roughen the surface using abrasive cloth (item 1 3, app D) and apply solid film lubricant (item 16, app D). Allow 16 to 24 hours to dry before handling.

Hold barrel (2) at 40-degree angle (muzzle down). Pull charging handle (8) to rear. Hold bolt carrier assembly (12) to rear and push charging handle forward. Release bolt carrier assembly (12). The bolt carrier assembly should close and lock under its own weight. If It does not, remove the bolt assembly (13) from the key and bolt carrier assembly (14) and slide the key and bolt carrier assembly (without bolt) back and forth In the upper receiver and barrel assembly. If the gas tube (4) hits the carrier key (1 5), or If the gas tube binds in the carrier key, try to correct the malfunction by adjusting (slightly bending) the gas tube In the area of the hand-guard assemblies. If unable to adjust, evacuate to support maintenance.

Adjustment does not correct the malfunction.

2-11

Item

Interval

Item to be

Not Fully Mission

No.

Checked or

Procedure

Capable if:

Serviced

Upper receiver and barrel assem bly (serviceability) check) (cont)

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