Yes I saw a guy on the EE selling his M96 with an Ar stock adapter.
They are more than likely going to be ultra rare though, since the M96 is rare as it is, and parts for it are not being made anymore.
No idea on the railed forend, more than likely no. But since it is (or looks to be) 1 piece, you could probably buy an AR15 rail and drill through the plastic to mount it (with the little steel plates on the back side).
Maybe use some epoxy on the rail if you want it to be ultra solid.