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For short, tightbore (namely KM 6.04 TN) inner barrels (never tested with long ones), I found uncrowned muzzles perform better. You have to make sure the lip is extremly clean though, with absolutely no burring. Point in case, I wasn't overly impressed with a "stock" KM M4 barrel, and when I started converting my M4 to a 933, I cut that sucker down without giving it a second thought... and low and behold, despite being shorter it actually grouped better.
My Match AR has a KM inner too; I'm redoing that gun now, and if I'm not happy with it, I'll probably try chopping the crown off, or get a PSG inner and cut that (my barrel/flashhider setup give me a bit of extra realestate than on a normal M16, so I might try exploiting that)
Oh and if you use a pipecutter, go extra slow or you risk crushing/constricting the muzzle end of the barrel (specially brass) and then you'll be really sorry you didn't take your time.
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