Barnes, what I mean by that is inconsistent wear on the rifling. With a crown, a tiny little wear pattern from improper cleaning methods will cause a "jetting" making that bullet lean upon exit of the barrel. With that QLA system, a tiny bit of wear on say one of the lands at the end of the rifling will cause that same problem BECAUSE of the space created without rifling. Granted it is more than likely tiny if it happens and it probably wouldn't happen to people such as you or several of us on this forum that have proper cleaning methods and loading methods that don't scrape the barrel with loading rods and such which will cause wear on the lands. I just see a problem waiting to happen with that system. Just had too many rifles come to me with horrible grouping because of a bad crown due to wear or just simply a pitiful crowning job.