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Hi Thomas and welcome. Thread pitch is 5/8x24 tpi. Precision Armament Stainless Steel Muzzle Brake would work no issue: https://precisionarmament.com/m11-severe-duty-muzzle-brake/

hread pitch is 5/8x24 tpi https://precisionarmament.com/m11-severe-duty-muzzle-brake/

Hi Thomas, this is threaded 5/8 x 24. Muzzle brake here >>> https://precisionarmament.com/m11-severe-duty-muzzle-brake/ Stay safe & have a great day!