My father-in-law gave his grandsons a model 54 Winchester chambered in 30-30. It had a peep sight on the back end (above bolt), but I removed it due to accuracy. Further down the barrel is an empty dove-tail slot that appears may have held a rear sight. Does anyone know where I can get a sight for this dove-tail slot? One other ? The serial number is: 31827A Can anyone tell me when this rifle was made? Thanks a bunch!