Hi Bruce..!
Umm - the HK's are something of a novelty - and like you - the more I do the research, the more there is to learn, on JUST this manufacturer (HK)..!
They are amazing - and any Luger is a wonderful "addiction" - but in my mind, HK's are a little "special". But - I'm quite biased....
Best to you for a wonderful New Year!!!
John