I just got my new 66-8 back from warranty work on Friday. Amongst other things I complained about the wide-ish cylinder gap at .010-.011 and burrs on the crown.

They replaced the barrel (probably because of the burrs) and the new cylinder gap is .003. Perfect!!!

As the old gap was in-spec, I doubt they would have replaced/refitted the barrel just for that. Regardless I'm happy now.

p.s. It shot fine with the .010 gap; but it was one of my dirtier guns. We'll find out in a couple of hours how this new gap performs.