Manual

TROUBLE

SHOOTING

PROBLEM COMMON

CAUSE CORRECTIVE

ACTION

Weapon fails to fire - Fire control lever on “S” - Move lever to “R” or “AUTO”

- Improper assembly of firing pin - Assemble correctly (retaining pin goes to the

rear of the large shoulder of the firing pin)

- Excessive amount of oil in firing pin hole - Clean with pipe cleaner

- Defective ammunition - Remove and discard

- Too much carbon on firing pin - Clean

or in firing pin hole

Bolt won’t unlock - Dirty bolt - Clean

- Burred bolt - Refer to Weapons Technician

Failure to extract - Broken Extractor Spring - Refer to Weapons Technician

- Dirty or corroded ammunition - Remove

- Carbon in chamber - Clean the chamber

- Fouling or carbon in the extractor recess or lip - Clean

Failure to feed - Dirty or corroded ammunition - Clean

- Dirty magazine - Clean

- Defective magazine - Replace

- Too many rounds in the magazine - Remove the excess ammunition

- Movement of buffer is restricted - Disassemble and clean the buffer and return

spring

Double feed - Defective magazine - Replace

Round will not - Dirty or corroded ammunition - Clean or replace

chamber - Damaged ammunition - Replace

- Carbon in chamber - Clean

- Damaged gas tube - Refer to Weapons Technician

Bolt will not lock - Dirt, corrosion or carbon buildup in the barrel - Clean

locking lugs

- Faulty magazine - Replace

Failure to eject - Broken ejector spring - Refer to Weapons Technician

- Movement of the buffer is restricted - Remove and clean (before assembling the bolt

to the carrier, ensure that the gas tube fits into

the carrier key and that the carrier moves freely

within the upper receiver)

- Gaps in the bolt rings not staggered - Stagger the ring gaps

- Carbon or dirt in the interior of the gas key or - Clean

on the exterior of the gas tube

Bolt fails to lock after - Dirty or corroded bolt latch - Clean

the lastround has fired - Faulty magazine - Replace

- Dirt in the barrel extension - Clean

Fire control selector - The selector is dry - Lubricate

binds - Dirt or sand under the trigger - Clean

10047S