From a business perspective I’m surprised SIG is releasing these grips so soon. I guess they figure other companies will so they may as well too!
It is, but unless there’s a different manual safety lever in the future, that’s the engineering constraint at the top of the frame. The grip is wider but the frame has to be the same at the top or else they lose safety compatibility.
I could be wrong and it could be wider, will see in a few days when I get mine.
Pictures!
https://imgur.com/a/a4m7bhp