Yup thats the problem. I went to a gun shop today and looked over a few Ruger M77s. I couldn't tell you where that box is now. A little history on the gun. My father bought it new many years ago. It has never been to a gunsmith. He may have taken it apart to clean it and forgot to put it back in. How hard is that procedure? Looks like two screws and I am done. Anything I should be concerned with?