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I noticed the P320's .40 caliber mags lack the vertical ridges present on the 9mm mags. Anyone know why that could be? Was the P320 designed around the .40 caliber?
 

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I'm guessing it has to do with the diameter of the cartridge. The 40, being bigger, fills the full width of the magazine. The more narrow 9 needs some space taken up, hence the filler ridges.
 
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