Yep. When I went to the range, the issues started up again.
Because the armorer "TWEAKED" the ejector I might throw the whole thing, trigger housing and ejector away. See I don't know if it was done with the ejector in the housing or not and it is just plastic. But because you stated the problem fixed and it returned I would have to assume the trigger housing is trashed too.
My G19G3 had erratic ejections, FTF,FTE
A (FTF) Failure to Feed or, Failure to Fire?
A cleaning of and checking on the extractor might be the next step if you are having a Failure to Feed issue. A tight extractor can cause that, as well as many other things.
A Failure to Fire with a Failure to Feed is usually associated with Limp wristing and this will also cause erratic problems.
The other (FTE) Failure to Extract or Failure to Eject?
Just too many things that can cause all these issues with out having the gun here to look at.
Please allow me to add: I personally have never seen a GLOCK, New right out of the box that won't shoot as designed. Most of the problems are shooter induced or involves ammo issues.
We here on this site, as far as I know don't know the condition of the weapon either so trying to dianognos the problem is all but a guess, IMHO without just telling you to replace parts, one peice at a time.