Let's assume I don't know any different and make it into a logic puzzle.
1) IMPD attempted to issue the guns roughly 9 months ago and "recalled" them from officers who had them issued within a few days.
2) IMPD told officers the guns would be fixed and issued at the next in-service.
3) The guns were not issued at the next in-service.
4) Every officer on IMPD is still issued a Gen 4 Glock 22.
Square those facts with "Well technically not all the guns, only some of the IMPD. And the issue was apparently quickly corrected. I was most likely an isolated production issue, since the model was fairly new."