I don't much about the Gen 4's but I can tell you that I've carried (for work) a Glock 17 Gen 2 for almost 13 years now and have never had any problems. I can't even tell you how many rounds have been through it. Still has all original parts. I considered changing a few times but I just can't break free from it. It's never failed me and considering that I need to use it to depend on my life that speaks a lot for itself.
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