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by AC, from TX, United States Asked on January 14, 2019
    The barrel nut is not included. This uses the factory barrel nut on the Sig M400 Tread rifle. Unfortunately Sig does not sell the barrel nut separately at this time.
I cannot find a description from any vendor that indicates the Tread handguards come with a barrel nut. However, I was surprised that my order from Optics Planet (15" model) which arrived on 12/09/20 had not only a barrel nut but also a barrel nut wrench in the handguard package. I am curious as to how this happened and I doubt that is standard. Nonetheless, I will take it.
IT DOES NOT COME WITH A BARREL NUT AND SIG DOES NOT OFFER A BARREL NUT FOR SALE AT THIS TIME. 01/17/2019 AIM SPORTS OFFERS A REPLACEMENT BARREL NUT (AR556BN) AND SCREWS (ARHGMS) BUT I DONT KNOW IF IT WILL WORK
Mine (13") that I received today, 1/17/24, DID come with both the barrel nut and required wrench.