Going on 1500 rounds through my Gen 4 G17 without an issue. Both my Gen 4's have been solid from day one. I rank them up there with my old Gen 2 G21.
-Glock Gen 4 G17/G19
-Sig P226 Navy/Sig 2022 357 Sig /Sig M400
-Walther PPS/Walther PPX