556 15 x 1 Thread and made from 15-5 Precipitation Hardened stainless steel. This brake does not need to be clocked and will provide better flash and noise signature unsuppressed but with less recoil reduction when used on its own.
Works with both titanium and inconel suppressors.5.56 Ratchet Lock Flash Hider Brake Works with Ratchet Lock Suppressor for 5.56 & 7.62 and smaller.
Needs a minimum barrel diameter of 15.5mm for adequate shoulder to pull up against.