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Are you proposing a FAST stock? I would probably consider that if it has a side sling mount point.
I know the cheek weld isn't the best with an optic - but I have Troy Micro irons on it. The NEA is fine - I just can't stop swapping out the stocks (this would make the decision for me).
On the bottom of the plate that bolts to the rifle?
It would be best to have it on the side of the adapter/stock. I wonder if a shop somewhere would have the tooling/time to mill in a socket on the adapter.