Also chambered round indicator, different angle on the rear of ejection port, it says "gen4" on slide, magazine is ambidextrous, magazine follower is 6th gen on 4th gen Glock, changeable backstraps on gen4... That's all I can think of. 
Difference between Generation 3 and 4
I have a Model 19, Generation 3. What is the difference between it and a Generation 4 besides the back straps?
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