What Thread Pitch Is my Aero Barrel? 9mm, 5.56 NATO/223 1/2x29 6 Creedmoor, 6.5 Grendel, 6.5 Creedmoor, 300 Blackout, 308 WIN 5/8x24 Related articles Anatomy of a Barrel Torque Specifications Muzzle Device Install How to Clean Your AR15 Bolt Carrier Group My color anodized finish has imperfections/does not match.