"After looking at the fine display of innards here and
noting so many similarities, I marvel the Ruger GP100
design (not shown) is a real departure from all the others."
I have a GP100 and Super Redhawk but find the refinement to fall back behind the Six series and lacking in double action.
Feel free to display a photo of the innards here.
The Speed Six is much slicker!
But the Ruger SRH and GP100 with Nills are not too bad, either.