17, 19, 22, 23 to the best of my knowledge. I owned a 17 briefly and was very happy with it. I regret selling it to buy a 19 gen3 rtf2. I will either sell this 19 off and avoid any more glocks or buy a 19 or 23 gen4.
FWIW, I fired around 650 rounds through the gen4 17 with various types of loads and never had any failures. 650 rounds isn't long, so what do I know? I do feel that it was reliable enough and dependable enough for me to carry or trust with my family's life, despite internet rumors. The 19 is reliable, as well...I just liked the g17 gen4 I owned much, much better.
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