JARD Ported Brake 6.5mm Creedmoor 5/8x24 3/4in Diameter 416 Stainless Steel Stainless. This brake disperses the majority of exiting gas radially reducing backward force and felt recoil. Comparatively traditional barrels or barrels without muzzle devices gas is predominately expelled linearly creating backward force that adds to recoil. Specifications for JARD Ported Brake: Manufacturer: JARD Length: 1.87 in Package Contents: JARD Ported Brake JARD 5402: Ported Brake 6.5mm Creedmoor 5/8x24 3/4in Diameter 416 Stainless Steel Stainless