Note: the procedures below describe cleaning with a standard military issue multi-piece rod cleaning kit. Other commercial cleaning kits may include alternate instructions, which may be just as effective.
Clean the Bore…
- Always clean from chamber to muzzle in the natural direction of the bullet.
- Attach the three cleaning rod sections together, but leave each one about two turns short of being tight.
- Attach the bore brush, leaving it two turns short of being tight.
- Never run a brush down the barrel first or dip the brush in solvent.
- Swab out the bore with a patch moistened with “CLP”.
- Point muzzle down. Hold the upper receiver in one hand while inserting the end of the rod without the brush into the chamber. Do not let either rub the bore, this will scratch the bore. About 2 - 3 inches of the rod should protrude out of the muzzle end.
- Attach the handle section of the cleaning rod to the threaded end that is sticking out of the muzzle. Diagram #2
- Pull the brush through the bore and out the muzzle. You should be able to see the rod twisting as you pull it. This is the brush “tracking” in the rifling. Never reverse the brush in the chamber or bore.
- After one pull, take the handle section off , and repeat the process.
- After three or four pulls, the three rod sections and the bore brush may become screwed tightly together. Loosen them up and repeat the process.
- Send a patch through the bore occasionally to help clean out the debris that the brush has loosened. Just replace the bore brush with the rod tip (patch holder) and a wet patch. Pull it through. If you leave the rods loose again the patch will “track” in the rifling as before. But remember, always have the bore wet with cleaner before trying to pull a brush through.
Disassembly of Bolt Carrier Assembly…
- Clean the bolt carrier assembly and components in a suitable cleaning solvent and remove any built-up carbon from the bolt.
- Clean the rifle using a commercially available gun cleaner (WD-40 works well for cleaning exterior surfaces of the receivers.) Clean bore with bore brush and wipe out with cleaning patch.
- Re-assembly is reverse of disassembly.
- Remove bolt assembly from carrier.
- Remove firing pin and spring.
- Remove extractor pin, extractor, and extractor spring.
- Remove cartridge guide, by removing end from hole and pulling wire from slot. Pull wire down to remove.
Bolt assembly should be disassembled only when dirty or damaged. Always replace damaged parts or see a qualified gunsmith.
Inspection Before Lubricating…
- Check the bolt: Look for cracks or fractures. Bolts with any pitting extending into the firing pin hole should be replaced.
- Check the firing pin: If it is bent, cracked, too sharp, it should be replaced.
- Check the extractor and extractor spring. If the extractor is chipped, or has broken edges in the area of the lip that engages the cartridge rim, it should be replaced.
- Check the cartridge guide for wear or damage. To reassemble, make sure cartridge guide is pressed back in place and the end should pop into hole.
Upper and Lower Receivers:
- The inside of the upper receiver, bore and chamber (using cleaning rod and patch).
- The firing pin with CLP.
- The charging handle and the inner and outer surfaces of the bolt carrier.
- All moving parts inside the lower receiver (trigger, hammer, safety, bolt catch, etc), and all its various pins and detents. Don’t forget the takedown, pivot pins, and their detents.
- Wipe off fingerprints (they can start the corrosion process on any metal parts) from exterior surfaces with a soft oiled black rag (black rag prevents visible lint).