I finally got a chance to run my standard 200 round break in on my new Gen3 17 yesterday and had a few issues, but not the usual ones. The gun easily and problem free digested and ejected 200 rounds of junk ammo (WWB, Tula, Federal Champion, and Remington UMC). I only took two empties to the face. Now, the issues are....sights and mag release. I had to move the rear sight all the way to the right edge of the dovetail to compensate for the gun shooting left. Now, before you say it was me gripping wrong or bad trigger control, I had two other people, both highly trained shooters, fire a mag through the gun and it was consistent shooting left for all three of us. The gun has stock Glock sights (white outline U and white dot), but not plastic, I upgraded to metal ones (Glock brand rear, Ameriglo brand front). The second issue is the mags do not want to drop free when empty. I have 12 mags and they all did this. They are brand new and the Gen4 compatible most recent version.