Depressurizing AirForce Talon SS

AGN Members,

I added a Altaros Regulator from TalonTunes to my Talon SS. I need to readjust Regulator . In order to do this I have to remove it. How do I depessurize the tank? With 2000+ Psi I am a bit edgy on doing this. (AirForce Say's DO NOT dry fire) Loosen explosion disc screw a bit or slowly unscrew Top Hat valve from Regulator til it leaks slowly ?
BTW, Without the regulator I was getting 790-830 FPS Power wheel set at #8. I set the Altaros to 125 BAR now getting 640 FPS. Small change increase (650 FPS) at #10. Another Problem is My YH now shows 3000 Psi and the Talon only 2000 Psi, Altaros 140 BAR. Any knowledge on these questions greatly appreciated.

Bill
 
This is what the Altaros Regulator looks like installed
20230717_191601.jpg
20230717_191641.jpg
*Note The Altaros pressure has now risen to 200 BAR. The AirForce gage is just below 2000 PSI but the Compressor was showing 3000 PSI.
 
Just trying to learn how thing's work, I took the no longer needed Talon fill port out. Didn't find an O-Ring but some black chewed-up thread like material.
Anyone know how to seal the Talon fill port ? I'm now thinking of a pipe plug? I've got to stop digging the holes I keep putting myself in LOL.
I did learn that by loosening the fill port a little you can bleed off the remaining bit of air.
 
As of 7am this morning Talon gage 2000 psi, -100 drop. No leaks. However AirForce Air Guns is sending a new valve under warranty, Great Company.
FYI, Altaros is set to 150 BAR, Talon power wheel set to #8, 720 FPS. Using Crossman 14.3g for testing will switch to JSB 15.89g when all settled in.
BTW, Altaros answered the email question I had about the different gage readings between YH 3000 psi and Talon 2100 psi. Thought it might be larger Talon O-Ring than supplied Altaros O-Ring. Next time tank empty I'll take a look. Maybe some of this info will be of interest to some of you. Bill
 
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