SIG SAUER SIG556xi - Manual (Page 69)

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8.1 cleaning
The Sig556xi rifle must be cleaned after each shooting session or whenever performance is suspect. clean the rifle as follows:
1. unload the weapon per Section 4.0;
2. field strip the weapon per Section 6.0;
3. clean the barrel and chamber from the rear;
4. clean other parts of the rifle, using care to remove carbon and firing residue. Pay particular attention to the operating rod,
gas valve, and chamber areas;
5. lightly lubricate areas of metal contact with a high quality firearms lubricant or grease, paying particular attention to the
bolt/bolt carrier, receiver rails, operating rod, and gas valve;
6. apply a light coating of high quality firearms lubricant or grease to exposed metal surfaces to enhance corrosion
protection;
7. reassemble the rifle per section 6.1; and
8. Perform a function check in accordance with section 6.2.