Upper Receiver And Barrel Assembly

location item action remarks

M16a1 Upper


To avoid injury to your eye, use care when removing and installing spring-loaded parts.

When using solid film lubricant or dichloromethane, be sure the area is well ventilated.

When using P-C-111, avoid skin contact. If P-C-111 comes in contact with the skin, wash thoroughly with running water. Using a good lanolin base cream after exposure to compound is helpful. Using gloves and protective equipment is recommended.

M16a1 Assembly Layout

Upper receiver and barrel assembly may be equipped with low light level front and rear sights. The front sight contains radioactive material. If so equipped, do not insert metal objects into the post slot or otherwise treat roughly to cause breakage of the radioactive element.


Refer to TM 9-1005-249-10 for "buddy system" procedure on removing handguards.

1 Upper Receiver and Barrel Assembly a. Hand guards b. Fiash suppressor (1 or 2)


Remove. Using barrel remover fixture, place upper receiver and barrel assembly in vise.

There are two types of flash suppressors. The earliest design is open ended with three prongs. The latest is a closed-end design and is the only authorized repair part.

All M16A1 rifles assigned to divisional combat units should be equipped with the closed end suppressor. M16A1 rifles assigned to noncombat units and training center units may be equipped with either the open or closed type flash suppressor.

3-24 Change 2

TM 9-1005-249-24&P

location item action remarks

Removing Barrel For Suppressor

Using combination wrench and 1/2 inch-drive handle, remove flash suppressor.

combination wrench combination wrench


barrel remover fixture socket wrench ratchet handle barrel remover fixture machinists vise machinist's vise


Remove upper receiver and barrel assembly from barrel remover fixture.

Remove. Using ballpeen hammer and 5/64 inch-diameter drive pm punch, drive spring pin out of front sight assembly.


5/64 inch punch c. Lock washer (3)


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  • Alem Petros
    How to disconnect the barrel of m16a1 from the upper receiver?
    9 years ago
  • lexi
    How to disassemble the m16a1 barrel?
    9 years ago

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