PRS Talk Vertical grip for chassis.

https://masterpiecearms.com/shop/mpa-enhanced-vertical-grip/

The MPA grip has a nice little shelf for your thumb and should attach to any chassis that takes A2 style grips.

Personally I use the Ergo grip that came with my XLR chassis (https://www.ergogrips.net/shop/flat-top-tactical-deluxe-grips/) because I like how it's a little bit soft and squishy as well as being thicker than most standard grips. I'm biased though, I also have one on my AR just because I like how the material feels in my hand. Ordered it originally with a palm shelf since I liked having one for bullseye pistol, but I ditched the palm shelf pretty quickly after trying it on the rifle. The Ergo grips are pretty close to vertical, but not quite entirely vertical.
 
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I am currently running the mpa evg. I do have 2 TLC grips that I am about to try.i love the feel of them and the position it puts your hand. Check them out as well.
 
The MPA won't fit without some modification, BT/DT. I have both the Anarchy Outdoors and the new MDT vertical grips. The AO looks a little weird to me, but it fits great and is made of a very strong material. The MDT has the advantage of sliding back and forth to adjust trigger reach. I really wish they would sell a no-mod required MPA grip.