Be sure all three drive pins on combination wrench are fully engaged with barrel nut assembly. Wrench must be pushed toward upper receiver assembly to compress the slip ring spring In barrel nut assembly. Do not use a torque wrench to loosen the barrel nut assembly.
8. Using '2 Inch drive handle and combination wrench (8), loosen barrel nut assembly (11)
11. Remove retaining ring (13) using retaining ring pliers.
12. Remove slip ring spring (14) and handguard slip ring (15).
13. Do not remove barrel nut (16) from barrel assembly (12).
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