These are the sole replica handguards that have minor hex headed screws that hold the warmth shields in position. The copy Colt handguards actually have rivets (much like the serious thing) holding the heat shields in place. It's the early reciever without having fence across the mag release and all https://colt-combat-unit-rail-gun68999.life3dblog.com/30533664/the-basic-principles-of-colt-combat-unit-rail-gun-45