turn counter-clockwise... I used a rubber clamp to get a good strong grip on my shocker feedneck to twist it off. If you use a metal wrench make sure you wrap it around the feedneck so you don't scratch it when twisting. gl
I don't know of a marker where you have to take the body apart to remove the feedneck. It should be a fairly straight up opperation for your Ion. Clamp, twist, pull It took me less than 5 minutes to remove my stock feedneck and put on my qlock.