It's the HK vs FN Hestal thing. HK and FN Hestal fought against each other trying to get their PDWs to become NATO standards. HK offered MP7. FN Hestal offered P90. In the end, Germany vetoed against making P90 the standard and there are no standard NATO PDWs.
It's the HK vs FN Hestal thing. HK and FN Hestal fought against each other trying to get their PDWs to become NATO standards. HK offered MP7. FN Hestal offered P90. In the end, Germany vetoed against making P90 the standard and there are no standard NATO PDWs.
Technically the P90 performed better than the mp7 in the tests, but because of Germany's veto there would be no official standard PDW.
EDIT: There's a really good video about the P90 on youtube. It mostly focuses about its use in games but it also talks about the NATO tests in somewhat better detail.