50. USE OF THE AUTOMATIC RIFLE IN AREAS WITH HIGH TEMPERATURES AND SANDY TERRAIN
In training exercises, during matches and in combat in sandy terrain, it is necessary to adopt all measures for protecting the rifle and ammunition from dust.
During extensive use of the rifle in dusty terrain, the bolt and the guides in the receiver should be oiled frequently through the opening for the magazine and ejection port; the rifle need not be disassembled for this operation. Before reloading the rifle after each oiling, the functioning of the firing and trigger mechanism should be checked by pulling the operating rod to the rear and releasing it several times. In such dusty terrain, the opening in the receiver through which the magazine is inserted into the rifle should be uncovered only when changing magazines and during the period lubrication mentioned above. In combat, the slot for the cocking handle should be covered during lulls in fire by means of the selector cover plate, i.e., by setting the rifle on safety.
The rifle should be cleaned and lubricated after each extensive use. Special care should be taken in cleaning and oiling the working surfaces of the trigger and firing mechanism, bolt, operating rod, extractor, gas tube and magazine.
In combat, lack of time may make it permissible to fire the rifle without oiling it, but not without wiping the dust off all the parts. The rifle must be thoroughly cleaned and oiled at the first opportunity.