There is a top action D3 in TPS that has "DD" on flats. I can't tell from the photo if it's 6 blade but it looks finer then another D3 barrel on same page.
I'm thinking Parker's claim that the A grade barrel is finer then a B grade was just marketing hype because I can't see any difference. If both AH and BH both have "DD" barrels there can't be much difference?
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