They answered all questions while on the phone. 5/8x24 thread. They have the Lantac Dragon Muzzle Brake for it with the correct threading available. Non-adjustable gas block on .308 Faxon barrel model. Apparently the 6.5 Creedmoor has the adjustable gas block. Stag LPK. IRunguns made that easy! I'm looking forward to seeing what the accuracy will be.