The silver finished slide of the G43X combines its short and slim dimensions to the extended slim frame size of the G48. A perfectly balanced slim fit for nearly all hand sizes with a satisfying magazine capacity and high concealability. The magazine capacity of the slim 01 magazine of the G43X is 10 rounds.
If you're deciding between this gun and the Sig P365 buy this one. I purchased the p365 last year (after the striker issues were resolved), and still love that gun. However if you're like me and have big hands, even with the extended mag it will give you trouble. There's just something about the Glock reliability that puts my mind at ease. While there haven't been many issues with my sig, knowing the 43x is going to always work for me when I need it is huge. Shootability is also much better with the Glock because of its larger frame size.
Still if you're undecided here's my opinion who each gun is best for after owning and carrying both....
Glock 43x: People with larger hands, reliability is a big factor, shootability is important
Sig p365: Smallest gun possible without sacrificing capacity