If you ordered a SuperCORE separately, you’ll have to install it yourself. Fortunately, it’s fairly easy.
First, remove the screws on the side channels and the rear of the blaster.
You’ll also need to remove the one screw holding on the grip on the other side as well.
Next, remove the magback piece as well. Finally, you can remove the pins on the trigger and coupler and lift the trigger and top cover pieces out of the grip frame.
You can then wrap thread tape around the fitting threads and install your SuperCore.