This mirrors the performance of the G43 at my agency.Can’t speak to TC215’s agency but the FBI’s approved 43 and 43x are stock irons only and stock mags. Nothing is authorized except grip tape. They also must be after a certain serial number - so the most current model with the breech face cut, 02 mags etc.
My understanding is it took multiple attempts over several years with tweaking by Glock to get the 43 to pass the Bureau s standards. The up side of that is those tweaks are reflected in the current production 43 series. I don’t recall the MRBF but the total IIRC the total rounds was 6k vs 10k. Given the anticipated use (BUG/off duty) I don’t see an issue with that.
My own agency experience with the 43 was different and was prior to the current “rolling change” improvements. In short G43s were somehow approved but IME it was rare to see one of our G43’s complete a 50 round qual course with our duty ammo (124 +p gold dot) without at least one malfunction. Again 100% stock guns with factory mags.
When the 43x/48 came out we tested them and re-tested the 43 as a “baseline.” In short they all did so poorly not only were the 43x/48 not approved but the 43 was de-authorized going forward. Previously approved G43s were grandfathered but in my office most G43 carriers swapped them for P365s. Keep in mind this was prior to the current tweeks resulting from the FBI efforts and we were not going to change duty ammo or consider a separate (G43 only) ammo type.
IME the 43 series guns are not the equal of service sized Glocks. If you want/need that you should consider the G26.
If you do run a 43 series gun, vet it with your grip and your carry ammo. Personally I’d want 100-200 rounds without issue. It’s an investment but the 43 performance is different enough from service sized Glocks that I would not be comfortable with “10 rounds and call it good.”