My son purchased an early G30 Gen 4 and had numerous problems with it. Erratic ejection (including in your face), feed issues and and sight issues. Apparently, his had QC issues beyond the more commonly heard ejection.
Sent it back to Glock and they sent him a completely new firearm. New serial number so he had to do the FFL paperwork over again, but the second G30 had no issues. He got an extra couple of mags and a sorry.
"It's what you learn after you know it all that counts."
If you can't be a good example, then you'll just have to be a horrible warning.