Cleaning 

With the rifle in field stripped condition:

Using a suitable cleaning rod and brush, saturate the brush with a commercial gun solvent and run the brush from the muzzle end through the length of the bore and out the chamber end; repeat several times. Follow this same procedure but substitute solvent-soaked cloth cleaning patches for the brush. When the bore and chamber are clean, run dry cloth patches through to remove the solvent film.

If you do not intend to fire the rifle soon, run a patch with a small amount of gun oil through the bore to preserve it.
The stripped action parts should be wiped clean of any residue with solvent and dried. These parts should then receive a light film of gun oil to protect and lubricate them. The gas piston and gas tube, however, should not be oiled: just cleaned and dried. Ensure the bore is cleaned before firing.

All exterior metal surfaces should be periodically wiped clean and lightly oiled.