According to what I read elsewhere, Glocks are supposed to fit in holsters for the larger size guns in the same family. Previously I had found that true. My Gen 4 G19 fits in my Kydex holsters (JM Custom and Blade Tech) that I bought for a Gen 2 G17.
However, yesterday, I found that a new Gen 4 G26 won't fit in JM or Blade Tech holsters for either the G19 or G17. The issue seems to be some extra depth (maybe 1/16") from the top of the frame to the bottom of the trigger guard. A leather holster would probably stretch but it seems to be a no-go with Kydex.
For those who are more clued in to Glock variations than I am, is this normal or is it an anomaly? It would be good to know before dropping another $100+ for yet another pair of holsters. (I carry AIWB or 4:00 depending on dress code.)