Pete, I suspect that the uneven look you refer to may be the result of an error(s)in the etching process (most likely) or due to carding issues. If the uneven look was due to "greys", then I believe that redoing the barrels would not resolve this issue. I will be finishing up a set of Parker GH barrels that very definitely exhibit the "greys" effect. On a section of one of the tubes, the "greys" start abruptly and end abruptly along weld lines. It is a very interesting effect and not all that common, in my experience.