After checking to make sure that the chamber and magazine are clear, field strip the rifle as per figures #2 and #4 in the takedown instructions. If using corrosive primed ammunition, a solvent such as WWII -Korean War era G.I. bore cleaner should be used. 'Shooter's Choice' has also proved to be an effective solvent for corrosive primer residue. Using a cleaning rod with a .30 caliber brush with solvent, make at least ten passes through the barrel from the breech end. Then switch to a cleaning jag or slotted tip and push a clean, dry patch through the bore. Now pass a clean patch soaked with solvent through the bore. Alternate this procedure with wet and dry patches until he patches come out clean. Dry out the bore with a clean, dry patch, then apply a thin coat of oil to the bore with a final, oil soaked patch.
During the bore cleaning process, it is a good idea to give the chamber area a thorough brushing as well. A pistol cleaning rod with a .45 caliber brush is very effective for this process. After brushing the chamber at least ten times, cover the brush with alternate wet and dry patches and clean the chamber until the patches are dirt free. Do not leave a residue of oil in the chamber.
Clean the bolt carrier and bolt with a toothbrush and solvent, paying close attention to the bolt face and extractor area. Dry with a clean rag. It is a good idea to apply a thin coat of grease to the bearing surfaces of the bolt and bolt carrier. Use a lubricant such as "Parr All Weather Weapons Lube", "Plastilube" or "Lubriplate".
Remove the gas piston from the handguard and gas cylinder assembly. Clean thoroughly with solvent and a phosphor bronze brush. Remove all carbon fouling, dry with a clean rag, then apply a light coat of oil. The gas cylinder must be cleaned as thoroughly as the bore, especially if corrosive primed ammunition has been used. Once again, the pistol rod with the .45 caliber brush comes in handy for this operation. Follow the same procedure as cleaning the bore finish by applying a light coat of oil to the inside of the gas cylinder.
Reverse the takedown process and reassemble the rifle. Apply a thin coat of oil to the outside metal surfaces before storing. If corrosive primed ammunition was used, it is a good idea to check weapon for the next two days for any accumulation of rust. If rust appears repeat cleaning process again. Before firing, remove any oil residue from the bore area with a clean patch. Check the bore for any obstructions, such as excess patch material before chambering any rounds and firing.
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