Yankee Hill 26-MB-A Slant Muzzle Brake 5.56mm Threaded 1/2-28'' TPI Steel Black. 56mm Threaded 1/2-28" TPI Steel Black - The YHM Slant 5.56mm Muzzle Brake and Compensator hybrid is designed to reduce recoil as well as muzzle rise for a quicker follow...