A member here spoke with Mr. K. At shot. IIRC, he said there are no plans for a .45 S2K. It would be a totally redesign, aka- engineering impractical to try to up-convert a sub. Perhaps a search would find the quote. Oh well for a .45 carbine there is the highpoint. And the Mech Tech also available for .45 as well as 10mm, 9mm, and .40. And I think Beretta makes a .45 carbine. So there is some demand. I agree keep asking, and maybe they will make one.
Yes, and I just happened to be that guy.
There will not be a .45 ACP S2K. It would require a complete redesign of the gun as the existing design is not strong enough to handle the increased bolt thrust of the larger cartridge. The Hinge Area is barely strong enough for the .40 S&W cartridge and Geo told me that as it sits the .45 won't happen.
I then talked about a new design on the gun that would take the .45 and be made of metal like the original Sub 9. The idea of a limited production version of this gun actually appealed to him as it would have a Machined Receiver and Barrel Hinge which could be farmed out and use existing S2K parts like buttstocks, handguards etc. to keep the new parts count down.
It would also be a lot more expensive due to the lower numbers produced and the nature and cost of machined from billet parts.
Still there is a market for the gun as everyone wants a S2K type gun in .45 ACP. It would only be built around Glock 21 magazines which are also used in the Kriss Vee SMG Kriss also makes a Mag extension for those mags which ups the count to 25 or so. The natural extension product would be one in 10MM as they use essentially the same mags.
I see a significant market for this gun and a large number of Police Agencies, and Spec Ops Military units wanting it as well as just about everyone here.
However it is low on the list for Geo so don't expect anything soon and probably not ever. Our conversation was primarily a BS Session and they do listen to new ideas from the crowd. Whether or not they adopt those ideas is another subject.
So the short answer to your question is,,,, NO!