I know a few guys who swear by Prometheus over PDI (just for barrels), in AEGs and spring rifles, citing that PDI has, or might have, small flaws or less QC standard. I have personally used Prometheus barrels in spring rifles and they are great, no question.
I've also run a few PDI barrels in various PTWs and GBBPs and they were really good as well.
Don't go tighter than 6.03mm, so you're on the right track there.
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