You don't see many thunbholes around here. However, I do remember reading about them possibly coming up in the governments hitlist about a year back. I guess they thought because it looked different, it was just too dangerous LOL.
Anyhow, they supposed to help if you need to scoot the cheek forward on the stock to take sight. I would also say that they will stiffen the grip area, and may keep them from cracking easy.
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