It appears to be a 91/30. It has a round, low wall receiver, flat rear sight, Izhevsk arsenal stamping. As stated above, it's dated "1937r."
The stock has been cut back, so that the barrel protrudes 14 5/8" beyond the end of the stock. The front of the stock is carefully rounded. The cleaning rod has been omitted.
Also, the rifle has a non-drift adjustable blade front sight w/o a protective hoop. The front sight doesn't look like any I have seen pictures of, but I can't tell whether it is original or not.