The aluminum heat shield is bolted to the fore grip, 4 bolts down from the top sides. Both parts are from the ATI Raven Forend package. Unfortunately, it has been discontinued, and no longer in production. The other parts of the Raven package were junk. The stock was too heavy and complex, and the tube extension and tri-rail would not stay tight. The only good parts were the Forend and Heat Shield. If you can find one, grap it.
For multi-gun competition, I flip the gun upside-down and rest the but stock on my shoulder to reload. Therefore, I need the heat shield to keep from burning my left hand (either that of the MJ single glove).