Will spare you the details, but yes, some earlier models of Gen 4 pistols have had issues. Since then, issues have been resolved. Keep in mind that there is, through any brand/make, product that slips through quality control... and the web is one of the best places to hear about the less than 1% defect rate factory has claimed.The sheer volume of Glocks in the wild that compose that 1% could be all the more concerning. However, know that if you were to be of the unfortunate few with problems (and it shouldn't take long to figure it out), the factory will do all they can to make things right, up to and including a new pistol, if necessary.
FWIW, I have recently sold a Gen 2 and a Gen 3, both are being replaced with new Gen 4s. Buy with confidence.
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