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					Originally Posted by svandamme  I've had it fail to battery with the cheap mec gar mags a few timesWhen that happened there was a visible gap between the breech face and the barrel. And in those cases i could bump it shut
 
 This is different, as the slide does not want to move, it's feels very stuck , needs quite some effort to release.
 And there is no gap at the barrel / breech face
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 This sounds like the extractor is too tight. Too tight can cause it not to go fully into battery and also make it very hard to eject a live round.