[DarthSkeeter]

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...

 

[NM_P99]

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.

 

[P88]

When I try to load 9mm rounds into my .40 mags, they just pop right out.

 

[DarthSkeeter]

Thanks guys... that sounds pretty definitive... need to wait for the AWB sunsetting... (please please please...)