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I suspect that there is not a barrel nut included as it is nit mentioned in any of the specs at other online sellers or on the CMMG site Link https://www.cmmginc.com/product/barrel-sub-assm-16-1-mt-4140cm-sbn-5-56mm/ I would call CMMG to verify PHONE 660-248-2293 web contact link https://www.cmmginc.com/contact/

The barrel nut comes with the hand guard and is specific to the type and/or brand of the hand guard.