I love the GAP finger rest, used it on baby Glocks, it's excellent in all respects.
I've been nagging them about creating one for the Shield ever since it first came out.
They assured me they were working on it, but after close to 2 years I had little faith it would happen.

Then I checked their web page today, and it's completely refreshed and redesigned!

https://concealablecontrol.com/

The old page always kind of looked dreary and didn't have much life to it. But now they're listing many more models and indeed actually list one for the Shield, coming soon.  Can't wait!

Now if they made it for the M&P9c. I like the compact but the grip length is just slightly awkward for me, my third finger doesn't stay on board with the flat base and my pinky doesn't quite with the extended base.

website only says "coming soon." there's no release date, price, etc. sounds like the same answer you've been getting all along.

Gap is awesome on G26-27

Hope they release them for Shield and start working on G42 and G43

I have a couple of the ndz and they work great.

I like the NDZ too. Scallop cuts on the sides aid in stripping mags.

2 months later, still "coming soon"

This is what I use, love em.