After many request from our customers, we have created this Muzzle Brake that matches the profile of the USGI flash hider, to make it legal for use in CMP and other matches. It is a 2-piece brake manufactured from 8620 steel with 60RC surface hardness and salt bath nitrided, corrosion-resistant finish. Rear mount made from 1144 Stressproof® cold drawn barstock steel for greater durability, tensile strength, and yield characteristics. CMP Match Legal. Front sight as shown in product photo not included.