You didn't say which model so I am going to assume it is the one with the Free Floating Aluminum Guard.
If this is the case the barrel nut is also part of the handguard. You may need a strap wrench to break it loose and I have hear rumours that DPMS uses a small amount of low temp lock tight to keep it from loosening. So you may need a little heat as well. You can call them to confirm.
The barrel nut and handguard form the entire handguard. Usually by having someone hold the rifle, applying a little heat and then use the belt wrench about 2-3 inches from the receiver will break it loose. Then just unscrew it. Should be right hand threads..
DonT
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