Machined from AISI4150 steel that is hardened to 48-52Rc (Rockwell C) and QPQ Nitrided for enhanced corrosion resistance and improved lifespan; Mount design is licensed from Dead Air, so customers suppressor warranty remains unaffected; Ships with timing shim set; Users should follow shooting guidance for the Wolfman as supplied by Dead Air; Lantac recommends the use of semi-permanent thread locker Rockset, sold separately; Can be pinned and welded to 14.5'' barrels to meet ATF 16'' minimum barrel length requirements