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.
-Glocks: Gen 4 G17/G19x2/G42/G43; Gen 3 Zev Tech G17
-Sigs, HK, Walther, Springfield...etc, etc