Just played with the new SAS 938 at local show, got me to thinking, wonder when Sig will off a higher cap P939 maybe capitilizing off the 365 style mags?

Interesting thought, but does that mean a longer mag or a wider mag well?

As long as we’re dreaming...

How about a P239 that takes P365 magazines?

Won't work. 938 is single stack and while the 365 mag is tiny, it's substantially wider.

Personally I like my P932 and P238 just the way they are!

IMO the OP is suggesting doing a revised frame that will accept the P365 magazines. Actually a rather interesting concept but I suspect the end result would be another Sig with a really wide for the caliber grip.