The 43x and the 48 have the same frame. 43x and 43 have the same slide. I actually bought my wife a 43X and comped it with an Agency barrel and 417c comp, but sadly haven't had a chance to shoot it yet thanks to coronachan... It's the perfect size, though, in my opinion. I plan on doing another just like it for myself eventually. Add some Shield Arms 15 round magazines and mag catch, and it would essentially replace my G19.