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Hi Gary and welcome. The big difference between Glock Gen 3 Vs. Gen 4, which many see as the grips. The Glock 19 4th Generation handgun adds texture and dimension. Full difference details here : -- https://www.wingtactical.com/glock-19-gen-3-vs-gen-4-differences/#:~:text=BACKSTRAPS%20AND%20GRIP%20TEXTURE&text=The%20first%20difference%20between%20Glock,too%20large%20for%20smaller%20hands.

Mainly grips.