Timely thread as I had mine at the range a few days ago.
My experience with the G43 hasn't been nearly as positive as others. My particular piece was purchased in September 2018 and I'm currently at 800 rounds down range. I don't find it particularly accurate or easy to shoot. I have had numerous malfunctions, mainly failure to lock the slide after the last shot, but also several failures to feed Federal HST 147. One of the older/longer running G43 threads did make some mention of an agency (or agencies) that only approved a specific brand/weight of ammunition (115 or 124 - can't remember), and there might have been something about +P as well. I keep telling myself the failure to lock the slide is likely grip (depressing the slide stop?), but it occasionally happens when shooting one-handed. Others have said they've deliberately tried to limp-wrist them to induce a malfunction - I don't have to try.
I keep pulling this one out every few months and trying to like it, but it doesn't hold a candle to my many other Glocks. Not sure if I got a lemon or...???. Again, I recognize that my experience is substantially different from others. YMMV.
-Rainman