I have been annoyed by the dust & lint that build up in the hollow part of the grip since the day I bought the weapon. Why can’t Glock supply the plug? Anyway, I found this on Amazon. They have the different sizes of course. Enjoy!
Have you looked into this?
Unfortunately, they don’t make it for the G43x MOS yet. I like the one that holds a spare battery for your optic though.
You may contact them. Perhaps they will find out people would like to have them for G43X MOS.
C&H is a great company. They listen shooters and make parts they are requesting.
I would show you my new one, but then I’d get thrown off the forums.