[OkFN]

Will the 'improved' FNX45 decocker/safety fit on a FNX9? Will Tactical FNX45 baseplate fit a FNX9 magazine?

 

[Pearlpower]

Will the 'improved' FNX45 decocker/safety fit on a FNX9? Will Tactical FNX45 baseplate fit a FNX9 magazine?

I do not believe any, or very little parts are interchangeable as the FNX45 is a wider larger pistol vs the FNX9/40.

FN Gun Parts

 

[wespac78]

FNX 9 and FNX 40 are interchangeable. FNX 45 not so much. Most of the parts are different between the FNX 45 and FNX 9/40