I special ordered a 20" 590 Special Purpose after Adventure Outdoors couldn't find the 590 they claimed to have in stock. Problem is I mistakenly ordered the ghost sight model #50663 instead of the model with the heat shield #50660 because I wasn't expecting to make an order and so I didn't have the correct info handy. By the time I realized what happened, AO already put the order in, so it looks like I'm stuck with it. The call taker this morning at AO suggested that I simply put a heat shield on the ghost sight model, but I remembered a old post from another forum that discussed why a heat shield won't go on the 590 ghost sight because of the barrel walls. A call to Mossberg confirmed this, of sorts. The rep said it wouldn't be easy to install the heat shield because it slides over the barrel, and the front blade sight of my gun cannot be removed. He recommended that I buy a bead sight barrel and install that barrel with heat shield. This I am not willing to do. Does anyone know if the heat shield is one solid piece? I expected that it would be open on the bottom, and if so, obviously there would be another option for installation other than sliding over the barrel. Even if it is one solid piece, is there a way to get it done without buying another barrel?