That is one handsome rifle! If it helps, I don't know if the scope was included from the factory, but it was certainly designed to work with those mounts, which in turn were clearly specific to that rifle. I recently posted about finding an M21 and M22 at a local gun show and they were priced at $1,400 and $1,500 respectively. Neither of them was a full stock rifle or included an original scope base and scope like yours.