The recoil spring assembly is the same for 9/40/357. The slide assemblies interchange and function, but you'd also need mags.
I was issued the .40, bought the 9. I'd stay with 9 mm. However, if you just gotta have a .40, you'd need slide, barrel and mags. There are machining differences between the 9 & .40 slides, you don't want to bet your butt on reliability with a caliber parts mix & pray approach.
Last edited by WR Moore; 06-12-2018 at 09:19 AM.
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