the gas adjustement doesn't move
It doesn’t move by hand. It’s friction fit and required an SVT wrench/multi tool. Get one of those and try to turn it.
Your gas regulator should not be adjusted without loosening the gas piston. Once you’ve loosened or removed the gas piston, the regulator is free to move. It may be a bit stuck from carbon so you can whack it down out of the gas port extension and replace it in the new position you want, holding it in place while you re-tighten the gas piston. There should be no condition where you actually strip the adjustment wrench, let alone two of them.
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Unscrew the gas piston (part I), once removed or loose, then the gas regulator (part II) can be knocked out for cleaning or rotated for gas increase or decrease.
Once adjusted (up, down, or cleaned), put back the gas piston and tighten the gas regulator. Not too tight..
Thanks for the picture! Unfortunately, the part you label as #1 is stuck and will not move. I put a wrench on it and twisted quite hard (this piece easily comes off my SVT). For my buddy, both your Part 1 and Part II are stuck and will not move even after soaking in Kroil. On my SVT I can move Part II without removing/changing Part I.



























