Just a quick query one of you Glock lads may be able to answer. The left side of the Roni body just above where the pistol grip meets the slide appears to be raised to clear something that is not apparent in the Hera version.
Maybe the controls for the Glock 18 auto version? But then why not on the Hera? Maybe a percieved better access to the slide release?
I have neither the Hera, Roni or Glock but do tend to think about these things...