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Anyone know for sure if the FNP-9 slide/barrel is interchangable with PRO-40 frame ?

I am a long time Beretta shooter (used to switching 9/40 cal top ends /mags with regularity). I have the chance to pick up a good deal on a nib PRO in 40, but would be a no brainer if I knew for sure I could swap out top ends/mags and have the choice of 2 cals, 2 fire control systems with the either combo

thanks
 

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The slides will swap but the magazines will not. The .40 has the mag well opened up a little bit more than the 9mm. If you try to put a 9mm mag in a .40 frame it will not engage with the mag catch and just flop around in the mag well.
 
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