Hmm, dignitary protection would seem to be the only niche that I can really think of for machine pistols. The Glock 18 or Beretta 93R, for example, have such high rates of fire that it's hard to carry a decent supply of ammo for serious suppression fire. The HK MP5 PDW, on the other hand, can also be toted around, but can extend its stock to become a serious fighting tool for extended ranges (beyond interior CQB).
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