Sights compatible with the Glock 43, 43X, and 48.
The Glock 43/43X share the same slide, and the 48 is the same width and geometry but longer.
Since the Glock 43X and 48 are somewhat larger overall due to the frame/grip length, they can accept some full size pistol sights without the sights seeming "too big" on top. We strongly recommend our Glock Rear Sight, Low Profile, Standard Height (.250" net blade height) and a .250" tall front.
Due to the wide variety of possible mounting solutions for the Glock 43x/48 MOS, we haven't been able to get data on all of the combinations. Here's what we can tell you so far:
Holosun 407k/507k with C&H Precision adapter plate: Lower 1/3 cowitness with Glock Rear Sight, Low Profile, Standard Height (.250" above slide) and .250" tall front. Rear of optic is .180" high at the rear.
Trijicon RMRcc with C&H Precision adapter plate: rear of optic sits .350" above slide, too tall for our Glock Rear Sight, Standard Height, Low Profile (.250 above slide) or even the Glock Tall MOS Rear Sight (.320 above slide).
Your amount of cowitness height in the optic window will vary based on your optic and its mount.
View through .325" tall MOS rear on a G48