Can't say I know enough about the JP gas block to answer your question, but I was also under the impression that totally tight meant totally closed. Maybe they have a different system for minimal through excessive gas flow. If it shoots soft, I don't see a reason to be concerned.
Out of curiosity, you mentioned waiting for new rings. Do you not like the Larue that you're using, or was that just a temporary mount while you waited for another? Whenever I finish my 308 project (which may actually happen in a few months, if the manufacturer finally gets their upper receivers back on the market), I was planning on not going the QD route and using an
AADMmount, as it has a built in 20 MOA and beefy lugs.
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