I posted in a recent thread about my brand new gen 3 g17 with ejection issues, dented casings and constant brass to the face. I called glock last week and after some arguing they agreed to send me a shipping label. I put the gun in the mail one week ago 6/6 and received it back today 6/13. enclosed was a note stating "inspected, upgrade (yes upgrade not upgraded), meets factory specs, tested ok. Still has 336 ejector, however the extractor does seem to have a tighter hold on the cartridge. I will be testing in tomorrow and I will follow up with results.