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Has anyone done this ? Does it work ? I don't have a P99 yet, so I can't try it.

I've heard the Springfield Armory XD's can feed 9mm rounds out of their .40 mags... allowing for some "hi cap" carrying...

I'd think about a 9mm 99 if the 16 round mags were available/legal/cheap, but it's so lame to lose the 6 rounds...
 

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It works on my H&K P2000, the USPc .40 mags hold and feed 13 9mm's just fine.
But on the P99's the .40 mags will not reliably feed 9mm's. The followers and feed lips are wrong.
 
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