| Position of C.H. | Immediate action. | Remedy. | Cause. |
| Forward:— | | | |
| (a) | Turn magazine free and change | | Magazine empty. |
| (b) | If magazine is fixed, pull back C.H. | | Missfire or space or rotation not sufficient. |
| (c) | If recur, change magazine | Examine rim of old magazine | Faulty feed due to damaged rim. |
| | Feed arm pawl. Stop pawls | Feed arm pawl, or stop pawl. |
| (d) | If missfire on pressing trigger examine return spring | If too light—adjust. | Weak or broken return spring. |
| | If broken—substitute | Damaged or broken striker. |
| | If correct—change rod | |
| (e) | If C.H. will not come back pull back with wooden handle | If dirty—clean | Dirt. |
| | If hot—cool | |
| C.H. back slightly | Pull C.H. back with wooden handle or pull through | | Bulged cartridge (should never get into magazine.) |
| | | Separated case (unknown as yet). |
| C.H. nearly back | Examine ejection opening, if clear pull C.H. back and carry on | | |
| or, back to full extent | If return spring is weak, adjust or change it | Clean gas cylinder, or piston rod and oil up | Weak or broken return spring. |
| | If it recurs, remove magazine and gas regulator and fire. After firing put back gas regulator, with large hole to rear | | Friction in gas cylinder or moving parts. |
| | If empty case is found, pull crank handle, raise safety catch, remove magazine and empty. Examine rim | If recurs, examine extractor ejector | Weak or broken extractors. |
| | | Broken ejector. |
| | If crank handle jams remove magazine | | Magazine not really home, or rim injured, or catch broken. |
| | If crank handle flies forward, insert new magazine, otherwise examine cartridge guide spring | Change if broken | Weak or broken cartridge guide spring. |