Lefty.  Thinking about getting a Guard 9mm or mo5 variant, probably a banshee or k, but i am wanting to make sure i could get a R sode CH on the hk clone (PTR).  Pretty sure you can on a full size mp5 but not sure about the k.

Apprently no other 9mm smg comes close to these two in being soft shooting.

Also, are there any of those binary triggers for an HK?

Pretty sure the cocking tube is welded to the receiver and changing it would be a big project.

I'm a lefty and have shot an MP5K. Charging it is more akward than you may be used to compared to an AK or other ride sude charger, but not awful.

If you dont have the scorpion evo though, I highly suggest that. It is very lefty friendly. Even the bolt release works better for a lefty by using the trigger finger. Not as smooth as the MP5, but it makes up for it in other ways.