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The Firefly rubbers were a direct drop in for me. Thank you for that thread that you linked. It's a good read. KSC Perfect BB's measure 5.95mm.
As an addition, the test that I did of the 7" 6.01 vs 6.03mm inner barrels: the 6.01mm was a brand new barrel, whereas the 6.03mm was used, but cleaned. Looking down the barrel, I did not notice any imperfections, but it may have built up a layer of grime over years of use that I was unable to remove with a simple cleaning. This could have resulted in the better performance of the 6.01mm over the 6.03mm in my test.
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