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It is 1/2"x28. And the muzzle brake the comes attached took an 11/16" wrench for me to remove, no thread locker or anything was on it.

Hi William and welcome. This model has a 16.1" Deep Spiral Fluted Barrel, threaded 1/2"x28 with a RATE-OF-TWIST of 1-in-8". Cheers and stay safe!

1/2"x28 see ***** StockFlat Dark Earth Splatter Gen II American Barrel FlutingSpiral Barrel Length16.10" Barrel FinishCobalt Cerakote *****Thread Pattern1/2"-28 Capacity10 Magazine TypeAR-Style SightsNone-Picatinny Scope Base MaterialAlloy Steel Weight6.2 lb. Twist1:8" RH Overall Length37.35" Length of Pull12" - 13.75" Grooves5 UPC7-36676-46919-2