Discussed this issue with Hull Cartridge on the "Weihrauch Stand" at the CLAGF Friday.
The .25 Cal 80k can be ordered through them (Hull) via your local WR dealer and the silencer IS available to suit the .25 which I dont think has been in the past.
I was also informed that the "left handed" stocks are now just plain with no monti-carlo type cheek piece and if you're a leftie and considering that option, then dont and put the money towards the .25 barrel option which is an extra !

And you always have the FAC upgrade if you wish !
I'm considering this OR the Theo. "Eli" in .25.

Hope that made sense.

"B'rider"