I assume that you mean the distance between the two bolts that mount the receiver to the stock from the stock bottom. Just with a tape, I get 7 5/8" on my 1903. I only see one bolt that attaches from the bottom of the stock on the No. 4 Enfield that I have. May be different with a No. 1 Enfleid or with the stock off. Guessing on just the spacing, I would say that it is a 1903 or 1903A3 stock.