Ok so I got a parts pgp in today that had something interesting. It is an old style valve but it is a newer version of it because it had a powdercoat on it, not the traditional oxide finish. I went to take the valve out and this was inside between the chamber plug and the 12gram. So on the outside of the valve.
It is threaded and it looks like the front grip screw is supposed to thread into it. The pgp is also missing the typical nutsert for the front frame screw. Has anyone seen this before and know if this is typical?