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If I could afford one I'd get an HK MP5 clone in 10mm. Out of a carbine, 10mm is a great performer. I had to give up my duty one, but would have gladly kept it. We use the Federal 190gr JHP but if you can get the "hi" locking piece (as in high pressure), you could look at using "real" 10mm instead of .40 Long.
Another option, especially since you want interchangeability with your sidearm... look at the Kriss TDI (they have fixed some of the teething problems from the early models), and a G21. Same ammo, same mags.
Let us know what you decide.
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