Loctite will seal it up right quickly... and if you use the right sealer it will be a major pain in the ass to remove - but if it fixes it, you don't have to worry about changing it before you rebarrel anyway !
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I use the term "loctite" as a generic term for thread locking compounds - I do not use the Loctite brand name products, 620 cooks at 500 degrees and the gas block can get a lot hotter than that.
Green loctite will seal it up and let you know if that is the problem... but if you want to use a sealer as a permanent repair, I would argue that it is not the right choice for the job.
I Think my plan is to temporarily band aid the gas leak between the gas tube and gas block and see if it helps. If the gas block is an issue I will then replace it.
The gas block is snug on the barrel, I needed to use a brass punch and a small hammer to get it to move.
Gotcha, and yeah it very well could be.
Looks to me like a cheap, low quality gas block.
Its hard to get proper cycling with all that gas leakage.
I'd get a quality replacement and be done with it.