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The title pretty much say it. Are the PPQ 9mm and .40cal frames the same? Would top ends be interchangeable between the two?
 

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If you have a PPQ in .40 S&W, you might be able to use it for .357 Sig with just a barrel change. I know they're interchangeable in a Sig-Sauer P229 anyway.
 

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You would need to swap the 9mm housing if you want to run a .40 top-end, but the other way around should run just fine.
 
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