Doesn’t work with 15 or 10 round mags - Beretta 92 Series Pistol Magwell Kit w/ + 2 Extensions

This doesn’t work with the factory 15 or 10 round magazines. Even with the base plates swapped out for the included 2, the magazines won’t latch and the slide won’t lock back. I can’t return it because it’s been installed and I can’t get 18 rounders in my state. $90 wasted. Looks well made though, I just couldn’t get it to work for me and there was nothing online warning g about this.