40cal

The last time I went to the range, I had various feeding issues, and one failure to eject with the one magazine I have that came with my 40 cal. I noticed that my firing pin actually punched a hole through the primer, and the cartridge was stuck on the firing pin. I was of course firing the...

I was browsing around and found 40 cal slides and barrels for sale with all the internal parts was just curious if I can swap this out with the 45 jhp or do I need the 40 cal setup?