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Gen 3, Gen 4 and Gen 5 GLOCK pistols look almost the same from a distance, but enough changed inside that a part listed only for "G19" can be the wrong part for your G19. This guide covers how to tell the generations apart, what carries across, what does not, and how to confirm fit before you order. How to identify your generation Gen 3 Gen 3 frames have finger grooves on the front of the grip, a thumb rest on the grip panels and an accessory rail on the dust cover. The grip has no interchange …