Help finding a grip

Theres multiple grips in the video, they may have made a one off aluminum version, there's regular ar15, and when it's on a vice there's the plastic MPA.

Have a buddy that tried one and got rid of it for the same reason, feels like it moves because it doesn't mate up to an ar15 cutout properly.
 
How big is the ergo 0 degree? Will it work for someone with small hands and would it fit on a XLR chassis?
The palm swell is quite pronounced. I’m going to sand mine down and I have big hands.
Yes it will work on a XLR.
You might want to look at the mdt offfering.
Here’s both on XLR’s

F11794C4-C75B-4592-86AA-5EF887F54EEA.jpeg
 
That does look pretty large. I have been eyeing the MDT vertical. Does it have a thumb shelf? I can't tell from pictures I've seen.
The Ergo isn’t bad front to back, just the width is a bit much.

a better shot of the MDT
35080F87-D2CE-4A57-8176-68DA12054590.jpeg

It kinda das a shelf.
Because of a hand injury I don’t try to float the thumb on the side to try and use it.