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Hi Justin, it is neither. It's considered it's own profile - Slimline. It bears more resemblance to Gen 5 but Gen 5 parts will not fit, you will need to order parts for the Slimline. Stay safe & have a great day!

Hi Justin and welcome. It is a Gen 5 : - https://eu.glock.com/en/products/pistols/g43x-mos#:~:text=This%20model%20has%20the%20incredibly,features%20precision%2Dmilled%20front%20serrations.

Justin, the 43x doesn't have a gen but it's based off gen 5. So it has the marksman barrel and ndlc finish like gen 5. Hope this helps.