I bought this stock class Phantom from a friend, and I've finally decided I want to try it open stock class. (That's the one with a tank/hopper, right?) I have the piece that screws in above the vertical 12 gram changer, but I'm not sure how to get that piece out. It has a Punisher undercocking kit on it, and it looks like it came with a custom vertical ASA, so I don't know if I'd need to do some serious overhaul to get it to work with a tank or not.
There is a seam where I think it should unscrew, but it is extremely tight, so I'm not sure how to get it unscrewed, if it does at all.
Here's a picture for reference, I can take some more if needed:
Thanks for the help!