The 6906 grips snapped on and fit fine. For some reason those "11 round" magazines will accommodate only 10 rounds no matter how much I push & press. Since the flush fit magazines accept 9 rounds I'll stick with those. Most have the finger rest extension, although one has a flat floor-plate that I've fitted to not stick out beyond the front grip.

I usually carry a Sig 938 or Smith alloy J frame. Last weekend I carried the 40, under a T shirt only, and it was easy to conceal, light to carry. Kind of surprised me as the little Sig and Smith have kind of spoiled me.