Who is the shooter in the picture?
If it's a small or perhaps extra small grip it might explain the extra width towards the back.
It's definitely not a Rink grip, as they have a screw in the lower part of the grip (in the back). Perhaps it could be a Nill grip but they're not good at marketing so I can't find any pictures of it.
The concave curve on the back of the palm shelf makes me think it's a custom made grip.
Rink can copy almost any kind of grip you send him.
In some cases he can't use his palm shelf adjustment system, if there isn't enough room for it in the grip.
In those cases, he sticks with the factory adjustment, or he makes it non adjustable (doesn't seam to be the case here...)
The second image reveals the white SteyrSport logo in the adjustable palmrest, so that seems to be an original part. Morini used to make the grips for the LP10's, so perhaps he's had it customized by CM himself. Another Serbian shooter, Zorana Arunovic, has had a completely custom grip made by him, for the Pardini SP. (Pics in her Instagram account)
I just ordered a Evo medium grip from Pilkguns, i have a LP1 medium grip. The new evo medium i ordered feels like a lp10 small. I can't wait to bolt that evo grip on my lp1