Got out to the range and was happy to see that my ETS 9 round magazines both function reliably. I previously ran similar around counts through the 12 round magazines also a good result. No problems at all. I ran three magazine loads of practice ammo and two magazine loads of critical duty plus P. Also of note is that the nine round magazine size installed in the Glock 43 is the exact same size as the ghost +2 magazine extension devices. So if that fits your hand well, as it does mine, and your holster well, as it does mine, I feel a lot better with the comfort of the 43 combined with the full grip and round count similar to a Glock 26. Just want to let you know. Happy shooting!