Not tight tolerances, but quality control issues - ZEV Technologies Z19 Duty Glock 19 9mm Stripped Pistol Slide

Yes. I read all the reviews about Zev slides and in particular this Duty slide which were all very favorable. That was not my experience. The channel in which the ejector rod travels and on which one of the optic lugs sits was not appropriately finished. Zev support merely told me to tap the rod with a hammer and break off any existing burr, but while that allowed the rod to travel in the channel, it was super rough. It marked up the rod and would lead to constant failures to eject. My proshop Glock armorer confirmed the quality control issues and also relayed to me his poor experience with Zev quality. I am glad this works for some shooters. I am not one of them.