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I'd definitely try some warmer ammo. I think the economical loads are dialed down too far to cycle new guns, with new springs. S&B seems to be the European Standard loading for 9mm. I haven't experienced any issues with .45 or .40, but those wwb and others ain't cutting it in 9mm, whereas S&B is running perfect, along with my mid-range reloads. This isn't about (known) gen 4 Glocks, but it holds true with many of them as well. Just a little more juice gets them back to perfection. I'm not ready to put Slick 50 on my rails, but I did get the goose grease out. They'll break in.
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