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I'm trying to remember what exactly it was that I read, but some/one of the European produced guns (I think it was HK) had some issues during early break-in if they weren't using NATO or higher pressure 9mm rounds. This was because the guns were designed around that cartridge. I believe it might have been on a compact model also (stiffer springs). I specifically chose to use NATO or +P ammo while breaking in my subcompact kahr since they have a reputation of requiring some break-in on some pistols.