What Carbon Fiber tank for the Walther Reign?

Seems like I remember someone saying that the tank in those is smaller than most and a different threading? I expect you'll have to determine what the threading is for the factory cylinder is, and try to find one to match or make an adapter. I think you'll probably have to cut out the front of the plastic "enclosure" too, but I'm not positive on that one... I haven't seen anyone one replace one of the factory cylinders on one myself.
 
I’ve posted this picture before, but for reference this is the space you have:

148D2117-6AED-4EE0-907C-FB5CFF62478E.1621800487.jpeg