a. Remove the bolt carrier group from the upper receiver group. Field strip the bolt carrier group. Wash all external surfaces with a patch saturated in solvent cleaning compound.
ORD F8I45 Figure 3-7. Oiling Bolt Rings b. U s i n g a small brush dipped in solvent cleaning compound, scrub all carbon deposits and dirt from the locking lugs of the bolt.
Brush the face of the bolt, paying particular attention to area behind the rings and under the face of extractor. Do not attempt to remove discoloration caused by heat.
When dry, place a drop of oil in each hole on the bolt rings and gas tube (figure 3-7). Add a light coat of oil to all surfaces of bolt and bolt carrier.
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