Cleaning And Maintenance


It must be emphasized that all automatic weapons require constant cleaning and maintenance and that most of the stoppages mentioned else-where are the result of the operator's negligence or lack of knowledge of his weapon. All weapons, whether automatic or repeating rifles, should be cleaned at the end of a day's firing and special care must be taken after firing with blank cartridges.

MAINTENANCE OF THE RIFLE Maintenance by the operator.

The FN Rifle cal. 7.62 mm only needs to be partially stripped for this maintenance (field stripping); maintenance routine is as follows:

• Use the barrel cleaning brush, oiled with the special rifle bore oil provided, and pass through the barrel several times

• Follow this by pulling through two or three dry rags

• Clean the chamber with the cleaning brush provided for this purpose

• Clean the bolt carrier, rear of the barrel and inside the body

• Clean the bolt, firing pin and its housing

• Clean underneath the extractor claw, without stripping it

• Remove the gas plug, the piston and its spring and carefully clean these parts, as they are exposed to gas fouling

• Clean the gas cylinder and wipe with a slightly oiled rag; this rag should also be passed through the barrel

• Very slightly oil the moving parts of the mechanism. Inspection and maintenance by the armorers.

It is essential that the rifle should be examined periodically by the factory that will check that the user is properly caring it for. All components of the rifle will then be checked for correct functioning. When this examination is made, the following special cleaning and inspection operations will also be carried out:

• Cleaning the exhaust port in the gas cylinder

• Stripping and cleaning the extractor

• Checking the gas setting

• Checking the sight and correcting, if necessary.


The barrel and gas cylinder must be cleaned regularly so that they never get into such a state that the use of abrasives is necessary; all abrasive material such as emery paper, sand, etc., is always harmful.

The full cleaning of barrel and gas cylinder should be done unhurriedly, when circumstances permit, as follows:

• Wash the barrel, using barrel brush, or sponge, steeped in special oil.

• Wash the inside of the front part of the gas cylinder and gas block, using the brush for cleaning the chamber and the special oil

• After the barrel and gas cylinder have been thoroughly cleaned in this way, dry carefully, using clean rags. After drying, the rag-usually white service flannelette-should come out of the barrel and gas cylinder unstained.

• After drying, slightly oil the barrel (bore and chamber) and the gas cylinder.

• Dry the outside of the barrel and polish with a oil soaked cloth.

The pieces of flannelette for this cleaning will usually be cut to the following measurements: length approx. 120 mm, width approx. 60 mm.

For passing through the barrel, use an unfolded piece, for cleaning the gas cylinder, double it over to give a 60x60 mm square before inserting in the loop of the cleaning rod or pullthrough.

NOTE: The inside of the barrel and inside of front half of the gas cylinder come into direct contact with the combustion gases and are also submitted to friction; they consequently require more care and attention. Other components are protected against oxidizing by phosphate (parts of the mechanism and receiver) and the piston and gas plug are hard chromed.

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