Manual

Rev F www.lmtdefense.com Page
21
TROUBLE SHOOTING
Shown in table 1. The trouble shooting guide does not cover all theoretical malfunctions. This also applies to
suggested causes and corrective action. Qualified gunsmiths or armourers only must carry out repairs.
TABLE 1 TROUBLE SHOOTING
Problem Common Cause Corrective Action
Weapon fails to fire Fire selector lever on “S” Rotate lever to “F”
Improper assembly of firing pin Assemble correctly
Excessive oil in firing pin hole Clean
Excessive carbon build up on firing pin, or in
firing pin hole
Clean
Bolt will not unlock Burred bolt Refer to Armourer
Dirty bolt Clean
Failure to extract Broken extractor spring Refer to Armourer
Excessive carbon build up in chamber Clean
Fouling or carbon in extractor recess Clean
Failure to feed Defective magazine Replace
Dirty magazine Clean
Movement of buffer is restricted Strip and reassemble buffer
and return spring
Round will not chamber Excessive build up of carbon in the chamber Clean
Damaged gas tube Refer to Armourer
Bolt will not lock Excessive build up of carbon on the locking
lugs
Clean
Damaged locking lugs Refer to Armourer
Failure to eject Unserviceable ejector spring Refer to Armourer
Movement of the buffer is restricted Strip and reassemble buffer
and return spring
Excessive carbon build up in the interior of
the gas key or on the exterior of the gas tube
Clean