FX Dreamline ACZ FT Chassis Regulator Question.

Hello

I recently picked up a new Dreamline in the ACZ FT chassis to use for Field Target comp. As far as adjustability and weight, it is a great gun. As far as adjustability, not so great. The hammer spring adjust is burred and you have to remove the gun from the chassis to tune it. 

And then there is the reg. All descriptions of the Dreamline w/ tube show the reg is adjusted by a small silver hex port at the bottom of the reg. On mine it looks like a bottle style reg and it is located on the side. This is important now because it is leaking and I need to remove and rebuild it. But as I can't find one example of a DL configured like this online, I'm asking for help identifying what I have before I pull it apart to fix. 

Please take a look at the attached pictures and let me know what you think I have here. 

And also, how do I depressurize this gun safely so I can remove and repair the reg?

IMG_0374.1634488257.jpg
IMG_0373.1634488258.jpg


Thanks,

PJ